There are precedents for it being all activities. Particularly anything you're doing that would be in line with your usual profession, whether you're getting paid for it or not.
So a laid off programmer could be penalized for working on an open source project to keep their skills current? Incredibly idiotic if true, but it wouldn't be the first time we've created screwed up incentives for the lower end of the income scale. I'm becoming more and more convinced that we should replace most of the welfare bureaucracy with a negative income tax.
Potentially, yes. In the case law I remember, exceptions were explicitly carved out for "hobbies", so if you can show that it's something you usually do as a hobby and that it's not interfering with your job search, you can probably avoid penalties, but I could see it being a major pain in the ass.
In reality, enforcement of UI regulations is somewhat spotty, and at least in California, a tech worker who's only on it for 2-3 months is unlikely to have any trouble. The risk isn't nonexistent, though.
