I somewhat disagree. The best way to protest is to try and get as many people to switch to Lemmy as possible to give this platform the opportunity to take off.
If you have a favourite niche community, create a Lemmy page for it and see if you can get the mods of the sub to advertise it or put it in the sidebar at least.
It’s going to be a bit of a ghost town at the start here until we can get some user growth and those niche pages are huge for it.
PSA: anyone still looking to protest, promote fediverse, any form of rebellion ON REDDIT, the place to do it is r/pics. you can post anything with basically no censorship. as long as you mention John Oliver somehow, the mods aren't going to bother you! ( kbin.social )
r/pics is wide open to all kinds of anti reddit posts, calls for spez to resign, whatever you want with the current rules right now....