I used to make money with patents. I've held six of them. But once US patents were weakened, it was no longer profitable. The trouble with a weak patent system

I used to make money with patents. I've held six of them. But once US patents were weakened, it was no longer profitable. The trouble with a weak patent system is that things which used to be patented are now trade secrets. How Waymo and Tesla do self-driving is a trade secret, for example.