Bad if you leave for a competitor. I've never really done so. Fintech, social media, recipes, bidding, e-commerce, fashion, saas, mental health, games, and so on. There's just a wide range of fields you can go into that don't compete and still use the same skills.

Unless the previous employer is slow and incompetent, if you've done good work, they'd probably be ahead and better funded. I'd take the money.

Only if you're a generalist. What if you're an expert on some specific tech?

I mean I would probably take the money and temporarily switch fields too but I don't think it's quite that simple for a lot of people.