

If you’re asking for money to fix bugs, that incentivises writing code with bugs, as if you write perfect code first time nobody will pay you to fix it
There’s certainly potential for that to be a problem. But it’s not necessarily insurmountable. For starters, I think the idea is you’re not paying to have your thing fixed, you’re paying to have your thing prioritised. The same amount of work is getting done either way, but bugs reported by people who paid will be prioritised over bugs reported by people who don’t pay. If there are no bugs reported by paid users, then unpaid bugs will still be worked on.
Ironic timing…