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.
The WCAG guidelines were updated from version 2.0 to 2.1 in June 2018. The updates in 2.1 cover changes in technology that have occurred since the previous version, and also address areas that were underrepresented in 2.0. What does this mean for you? Not a lot right now. The compliance level targeted is still WCAG 2.0 Level AA, and the 2.1 success criteria are in addition to those already existing in 2.0.
On July 26, 2010 (on the anniversary of the Americans with Disabilities Act) President Obama stated that ADA accessibility must also apply to the Internet. With that declaration, the Justice Department was tasked with setting rules for ADA accessibility for the Internet and websites. Since that time, the Justice Department has formulated recommended rules for ADA website accessibility. Those rules will soon be refined and officially released in the near future. Until then, there is a set of guidelines currently in place (http://www.w3.org/WAI/WCAG20/quickref) for websites to become ADA accessible. Even with these guidelines in place, many hospitality businesses have not yet complied with the guidelines. Now is the time to begin the process of making your current website ADA accessible or to consider a new website design that is ADA accessible.
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.”