That’s a separate problem though and should be handled like so. Dictating in law what content independent platforms can and cannot disallow doesn’t solve the walled garden problem. It just places greater challenges on new entrants / would-be competitors while still allowing walled gardens to exist. Plus you also then lose the diversity of TOS that might attract new users to new platforms. It’s a lose/lose outcome that doesn’t even attempt to solve the problem you’re identifying.
