On the contrary, the company with VC may be a bummer after some years and the VC wanted to get ROI: prices started to increase (or appear), change of strategy and abandon/remix the tool, close the store…
Being free and open source surely helps.
I think the future of an open source project and the company behind it really depends on the founders. If open source is really in their DNA, they will fight for it. If everything goes wrong, at least the open source code will remain. The closed code will most likely disappear with the company.
Thanks for your feedback! We really need people like you to point out when things are going in the wrong direction. It's often a difficult balance between making money and giving back to the community. So we need your outside perspective!
Think of it like this... you're basically only coupling yourself to ProseMirror. That's the schema you're storing in your database. TipTap is a set of libraries that you can use for your web app etc... but if you ever find it insufficient, you're free to role your own thing.
ProseMirror has been around for a long time and is unlikely to be going anywhere, but having a company with VC funding using it as its base helps ensure that if ProseMirror got abandoned, it'd likely get picked back up by TipTap or some other interested party.
Even if you're building your own editor, unless your editor has a need that ProseMirror's schema doesn't account for or solve it makes sense to use it.