There are bad actors in every domain, but cherrypicking one doesn't tell us much about the overall balance. (Heck, for every scummy lawyer who uses the ADA as their club of choice, there are probably 100 who specialize in extracting money using questionable torts claims. Prenda Law was infamous for being a pile of snakes, enough so that they justify their own wikipedia article [0]).

Countering anecdote with anecdote, here's an example of the importance of ADA lawsuits:

https://www.peds.org/campaigns/sidewalk-maintenance/curb-ram...

Atlanta has been awful about keeping their pedestrian infrastructure working. And this wasn't a profit-seeking lawsuit -- it was the DoJ.

[0] https://en.wikipedia.org/wiki/Prenda_Law