It is already, from both sides. There's massive censorship from the inside, with a killswitch already in place waiting for a moment to actually disconnect Russia from the global internet. As well as sanctions and embargoes from every other site, no matter if they're commercial or not, just because admins couldn't be bothered implementing anything better than blocking the entire Russian IP range.
Fuck you for saying this, though. Don't call to make the lives of anti-war people harder than it already is, you'd just be throwing more fuel into the fire by proving the Russian propaganda to be true.
Cuts from app purchases and in-app purchases. Of course, developers can implement their own payment gateways and distribute their apps in third party stores, but nobody would do this at risk of being removed from play store.