If you hop jobs, I'm not hiring you*. Yes I make those decisions. No I do not expect you to stay forever, but 1yr at a time I can barely get productivity out of you. Some of these people do 6 months. To everyone that knows, all that looks like is grifting your probationary period. Get hired, assigned tasks, fail spectacularly, get booted out or leave before they find out you're incompetent.

*Except one guy. He was a brilliant weirdo that job hopped because no other company would bend their policies to fit weirdo's requirements about work and life. He was exceptionally brilliant, like dozens of patents under his name, and literally invented novel ways of doing things. He got a try. His weirdness evolved into even weirder, we let him do his thing and whatever because again, absolutely brilliant. And he's still there and happy enough.