Yeah but they still don't have a stake in the way that users do. Shouldn't the users have an ownership interest since their contributions are a necessary condition for the continued existence of those platforms?
Users perform labor for Facebook every time they post, comment, or like. That labor produces real, material value for Facebook. The compensation for that labor rightfully must be negotiated with those who did that productive work. IMO the only just competition is in a material form, including users having the prerogative to vote for a certain number of seats on the Board of Directors.