So what’s going on here, most likely, is that the intake of new users is declining as opposed to people specifically being driven off the platform (as some users allege).

The difference, one would assume, is that on the whole, Reddit’s political biases influence more what is not shown (much like lemmy.ml banning people for any criticism of Russia, China, or North Korea, or the echo chamber in hexbear), whereas Lemmy’s tankie issue also manifests as people actively sea-lioning (e.g. Cowbee) and (especially from hexbear) overt trolling, which shows up more in people’s faces. Both are issues, neither are good.