Adobe is lax about it because they care about being the industry standard monopoly. When more people use their software and become proficient in it, more companies want to buy it so they have better hiring prospects, and Adobe wins.
The stories I've heard about most CAD companies, especially Dassault, is that they don't generally care about the pirated software, and if they do, the worst they'll do if you're just a hobbyist is send you a "cut it out dude" cease and desist.
The problems arise when you start using their software for anything that makes money, like sending models/drawings to other companies/clients or whatever. If youre trying to run a business with pirated software they will absolutely pin your ass to the wall with lawyers and go after every cent you earned using their software PLUS the cost of a full license PLUS whatever damages they feel like pulling out of their ass.