Larding big platforms with public duties like these — the sort of thing that costs tens or hundreds of millions to accomplish — also ensures that we will never be able to cut them down to size and break up their monopolies. Once you deputize Big Tech with tasks that no small tech can perform, you also foreclose on any measure that might make Big Tech any smaller.
This has been a growing concern of mine across the board, both from a security perspective and legelative level. It is all well and good to hold the platforms to account, the problem is that all these safeguards feel like they are really only working for the platform, because they are the only ones who can meaningful compete. I guess time will tell.