I don't think you understand Russian mentality. They largely gave up on democracy, freedom and lawful state long time ago. Those that really objected and were smart enough mostly went away and don't look back, since you can't fight that and survive, only join them or live in bitter poverty.

There are things that might work - big celebrities like top hockey players and other sportsmen could stand up and criticize Putin directly, not just issue some blank statements of wanting peace and not even mentioning what they actually mean by that (Ovechkin is a prime example).

Microsoft could ban any access to license servers, updates, office stuff etc (that might be a massive hit, I recall some UK submarines was running completely on Windows XP few years, I am sure half the state would stop working immediately).

Apple and Google could block any access to their stores, updates, apps etc... Ideally with some message explaining why, shown to every user. But that's a bold move, I don't think they have balls for that yet. Things will get much worse in Ukraine at this rate though, so this may change.