I've tried using it over the years but I never liked it because there was no information. So last night I looked at my local city and there is almost no information at all. I spent a few hours last night adding buildings and restaurants and removing incorrect items. It was actually kind of fun and therapeutic and I plan to do more of it tonight. My girlfriend thinks it's dumb and I'm wasting my time because Google maps and Apple maps and Bing maps exists but she just doesn't understand open source.
Edit: Apologies, I just realized this question is not Linux specific.
It's a cool project, but I've used it, and man is it not going to be a replacement for Google Maps anytime soon, as much as I'd like to get to a FOSS alternative. I can't use it to navigate to a building down the street lol
It's not dumb to contribute though because it's already okay, so it can only get better than okay, and the way that happens is contributions
The goal isn't to replace gmaps, though? If it was, I don't think they would care to allow me to map the species of tree of the height of a curb. Some apps are trying to use OSM as a base layer to provide a gmaps alternative, but the real goal is just to map the world, at least to me