Isn't a decent amount of spam blocked without our knowing? Telecom companies work to prevent spam phone calls, YT/Twitter/FB try to block bots or spam accounts

Isn't a decent amount of spam blocked without our knowing? Telecom companies work to prevent spam phone calls, YT/Twitter/FB try to block bots or spam accounts - all that happens without users consensually blocking each account. Most people don't even realize how much "speech" has been blocked that they don't even see?