I'm an airplane user, and have already moved our tooling over to retool. Fuck over their customers? I'm sorry, but you have a choice in what tools you acquire, buy, and invest in, if you don't take into account that the company is small, new, and requires VC funding to exist, I just can't empathize with you if you are angry about it not working out. I use new software because it usually gives me access to the team in a way that lets me build with them and get features that a larger incumbent won't provide, but that doesn't mean it will make the company successful, and if they fail it sucks, but it's not like they are actively trying to hurt me.

There are so many reasons it's not easy or straight forward to open source the software of a startup that failed. I don't know what to tell you, I guess since I've only worked for startups I kind of understand what risks are involved when working with them, but there are also benefits, it's a trade off that you should be making when you're informed.

If you want stability, buy from a profitable and stable company that can pen multi-year contracts that include liability clauses, and if your company has the leverage, get source code/on prem written into your MSA.

All that said: please, don't use new software or tools, avoid startups and steer clear of emerging technology, you'll feel less betrayed.

*I'm not a founder, never have been a founder, and never could be a founder.