You raise a very good point about self-sabotage and protestware. I'm reminded of the left-pad debacle from some years back that fell in the former category.
Protest via libraries is new and interesting, but I suspect boils down to a matter of acceptable licensing, liability, and guarantees.
While well intentioned, I have some anxiety that protests through dependencies that operate in production environments could cool adoption of open source projects. The solve for this will likely be more attention paid to governance of open source components--which is something I already encourage.
What trends are you folks seeing with protestware? There is a real need to spread these messages, but I don't see many consumers of said projects being receptive to their platforms assisting without consent.