Doing something to make money and making enough from doing it to keep doing it full-time are two very different things, and I would argue the latter would be more difficult, not less under your proposed system. Yes, corporations do that already because they can throw enough money at the case to wear down the plaintiff into settling. But how much more do you think they would steal if they didn’t even have to do that?

Why do most people lock their doors at night? Do they really think that a piece of metal stuck in a slab of wood would stop any thief who really wants to get in? No, of course not. But the amount of effort and risk required is enough of a deterrent that most thieves won’t bother.

Copyright law is similar in my eyes. Will it stop a huge corporation that is willing to dump huge sums of money into any one case? Not really. But the effort and money involved is enough to deter them in most cases. Remove that they have no incentive not to steal work. Find a catchy song? Get one of the thousands of artists on contract to re-produce it to a T, send it to your millions of online viewers, and rack up 100k views in 12 hours. Congrats, you beat the artist to their 15 minutes of fame and any chance they could get at exposure, their potential earnings are yours now and it hasn’t even been a day. Any future web searches for the song will show you as well, so the original artist will likely be very quickly lost to time, and everyone remembers that one track the Capitol Records conglomerate put out that one time. That’s the kind of stuff I envision happening with literally no safeguards.