Everything that big tech does at scale so they can dominate markets can be done in much smaller scales for not that much more money. Look at Mastodon! Each instance is mostly run by normal people who occasionally raise some money for server fees. You don't need Xitter or FB-level infrastructure to have vibrant online communities and social networking.
No matter how you slice it, web tech is not steel or food or clothing or medicine. It's just fucking ad-supported entertainment without overhead