I believe reversing for interoperability purposes is protected (at least here in the US), and I'd guess all reversing is "protected" if one doesn't share the resulting code (as with TFA), but I would bet that a crowdsourced setup like you're describing would run afoul of patent and copyright laws and ultimately the legal system is "he who has the most lawyers wins"

I have often wondered what the legal area is for sharing a Ghidra database that merely labels existing code, but I haven't looked into how much of the original binary gets packaged up with such a database