I think part of it is also fear of rejection. Easier to tell nobody then to put yourself out there.
And as much as I like to think I don't care about money, I think the reality is that it's hard to keep plugging away on some side project if there's no financial incentive (I speak as someone who's not financially independent, maybe not having to worry about money would change things).
Might as well list my most recent unlaunched side projects
- MindGarden.app (currently sitting at yume.fyi, and I need to redo the landing page). Basically started off as an attempt to make a Notion clone that I plan to open source, where users can publish folders of documents (eg. into a blog). But there's always more work to do (eg. bare minimum would be end-to-end encryption, proper image support, endless list of random bugs / unfinished work, and then there's extra stuff like multiplayer support, desktop app, etc.). Hard to stay motivated to keep at it when I don't see any potential for it to make money since it's basically an inferior Notion.
- zsync.xyz - Reddit / HN where my primary goal is that comment quality be high, and posts can be separated by tags. Put some minor UX modifications to try to incentivize that, and was going to put in some token incentives before the bear market and not finding a good strategy around that that can't just be gamed. But in any case I realized there's a massive chicken and egg problem with this kind of site so got bored and stopped working on it without even posting it anywhere.
- nomadz.app - A crowdsourced map of cafes that are good for working, where people can rate them by wifi speed, power outlets, etc. Didn't post it anywhere because it's kind of crap, and I realized it's probably not worthwhile to continue working on it. I still think something like this could be very valuable (I've been nomadic the last 5 years working out of coffee shops so finding good work cafes is a big deal for me), but of all the possible things I could be working on I can't rank this towards the top.
I'll try to put in the last mile to get mindgarden.app to a launchable state.
Of course now my side project attention is focused on a new app I'm building. I think this new app has more obvious utility, though would be difficult to monetize. But will do my best to actually finish and launch it!