I don't personally do this (don't have the spare cash for a ticket tbh) but it seems like just about every other cyclist already does this. People do it for a reason. Just update the laws to match reality.

Re: shitposts, it definitely strongly depends on who you follow. My home feed on mastodon is inundated with shitposts (and I like each one)

Not sure if it's the same thing, but there's several DIY bike repair shops. I'm only really familiar with the ones in Toronto, but I know there are plenty elsewhere.

Most of them are open for folks to come in and use the space to repair their bicycles 3 or 4 times a week. Always volunteers around to help out (usually only to give advice though, most of the time it is still on you to do the work). I love visiting them to do minor repairs, though have never been a volunteer (considered it late 2019, but then pandemic started and I backed out).

Their funding is usually donations, any parts you need to use. All of the ones I've seen also sell refurbished bikes that the volunteers build outside of the DIY hours. Usually really cheap, since they mostly use donated parts. Not quite as cheap as craigslist, but less likely to be stolen :)

Never thought of a more general space for repairing things. I really like the idea.