I don't think "regular people" are concerned about being harmed on social media. The story around abuse comes from very high profile people that receive the social media equivalent of what we used to call hate mail.

When a regular person signs up to Twitter they don't even get any followers let alone harassment. Abuse only happens when you reach a suitably large audience to enable it. Most people will never have that kind of attention.

I think centralization's domination in tech is due mostly to technical and business reasons. Centralized search is fast, centralized content is fast and high quality, discovery is easier...