I think it comes down to the community. If you don't want to be bombarded with crap you have the ability to block or hide that person. It's a personal choice and not a choice the social media company makes. If someone is harassing you you should be able to block them as well. I feel like it's more about giving people the power to make their own choices instead of some large corp trying to tell you what you can and can't see. There should be some measures in place as well. There's just some things that don't belong on everyone's feed. But in a fully decentralized system I feel like it would just be spam, porn and illegal crap for the most part sadly.