The ADA I have no doubt was conceived with the best intentions, but since it is so broad, it is is one of the most misused,and INTENTIONALLY misused pieces of legislation.
If your ADA signs were a few inches out of the prescribed locations and heights, they filed a lawsuit against you and demanded $5,000-10,000 as a settlement to drop the suit. It cost you $10,000 to respond to the suit and if you failed to respond you lost by default and were hit with a default judgment.
Another trick they did go into a company that was not open to the public and ask to use the bathroom. If you were nice enough to accommodate them they would photograph your bathroom and manufacture ADA violations to file a lawsuit. Then use this as a pretext to demand a formal ADA investigation of your entire facility
They filed hundreds of these suits over the space of 6 months.
They were eventually dismissed as vexatious litigants filing frivolous lawsuits and sanctioned via class action lawsuit but it cost a lot of people a lot of money to fight