Which is why paid licenses have an "Enterprise license" where response times is hours or max a day. I feel all FOSS projects should stop being fully FOSS (yes even if I get hate for saying this so be it) and adopt a mixed model where it is free up until revenue X$ and then commercial. Commercial would automatically entail fast response times (including fixing bugs, tagged releases etc).

The revenue X$ can be something reasonable. Have slabs for various revenue levels starting from something decently high: million dollars and up.