>I think it's probably a pretty prosocial thing to do, unless I'm missing something

Also massively illegal if you live anywhere that has a state level wetlands protection type law and the enforcement authority decides to exercise their discretion to make your life hell. They typically claim jurisdiction and authority over all activity in/around wetlands so theoretically you should be getting a state permit before digging a mailbox post hole or doing any sort of "management" of plants/animals but most of the time they just turn a blind eye to private homeowners who are being reasonable.

Wetlands laws and rules (non-criminal code generally, but wetlands are some of the worst) are written in a way to make RICO look like a meticulously scoped out piece of technical legislation.