You are correct, ADA defines an “employer” as any person who is 1) engaged in an industry affecting commerce; 2) employes 15 or more full-time employees each work day; and 3) for at least 20 or more calendar weeks in the year. In the context of physical spaces, ADA would not apply to companies with fewer than 15 employees. However, courts don’t seem to have come to a consensus on what digital compliance really should look like. Because websites can be accessed anywhere in the country, small business owners might potentially face lawsuits in unfavorable jurisdictions. If you are a small business owner, I would recommend consulting with an accessibility lawyer and ask what they recommend.

WCAG guidelines break accessibility issues down into three levels. Level A issues are the most urgent and include problems that can severely limit a disabled visitor’s ability to navigate or use the website. Level AA issues tend to be more rooted in functionality, addressing areas where improvement is needed to give disabled users the full experience of a site. (Level AA is considered the target standard for most commercial websites.) Level AAA issues are the highest standard, fine-tuning and expanding on issues identified as Level A and AA. While it is an excellent goal, full Level AAA compliance is likely beyond the reach of most websites.
Over 10,ooo business owners were sued this year (2019) and they expect that # to increase to over 100,000 in 2020.  And these are no-joke lawsuits.  They settled for $20k - $6million, average was $50k...crippling to most small business owners, and you can't win these cases.  Unlike GDPR, the ADA law doesn't require any notice before a lawsuit can be filed for non-compliance, and it doesn't provide any time for a company to take positive or corrective action before its filed, so there's no real defense.  It's basically just a race to see who wins...the site owner that protects his or herself, or the dirty lawyer that finds them before they did.  Getting sued is a REAL risk, not the usual fake scare we usually see that disappears over time.

The average cost for hiring a web designer varies greatly depending on the scope of the work, which may range from building a site from scratch to rebranding an existing one, as well as the amount of content and graphics the designer will create. In general, the more complex the project, the more time the design agency will have to spend. Because web designers often work on an hourly basis, the longer the project, the higher the costs; you can count on the web designer spending at minimum 10 hours to create a very basic website with just a handful of pages with few elements. Prices also depend on the designer’s skill set, the process, and the company’s rates. In general, the national average cost for a basic website package starts at $500, but a customized website can cost as much as $2,000 or more. Here are typical average hourly rates, broken out by the complexity of the work:

For discussion’s sake – while I don’t know the specific nature of your videos, my guess is that they might be demonstrating various techniques or other content in which simply hearing the audio of the video wouldn’t deliver the full context of the content. If making that content accessible is something you’d want to do, you’d likely want to start with a written description of what takes place in the video. Beyond that, high contrast vector images or diagrams showcasing specific parts of the technique would certainly help.
I have a membership website teaching martial arts. It is accessible only to people who pay a monthly membership fee. I recently had a gentleman in Malta ask if I could make more than 850 videos on the site accessible to him (he is visually impaired). That is an impossible task for a one-man business. If I understand this article correctly, my site is not required to be accessible?
This particular lawsuit amounted to nothing more than a shakedown for cash, as the current laws would make it difficult to win the suit in court (more about this later) but it prompted me to dive deeper into the issue of ADA compliance. Through my research, I discovered there are some new laws on the horizon that could make ADA compliance mandatory, which means web designers and digital marketers need to know how to prepare.
Most recently, however, pizza chain Domino's has been brought under suit for their website not being accessible for specialty ordering. The U.S. Supreme Court refused to review the case, instead upholding the decision of the 9th U.S. Circuit Court of Appeals who said the “alleged inaccessibility of Domino’s website and app impedes access to the goods and services of its physical pizza franchises—which are places of public accommodation.”