There were never any gatekeepers. You can't effectively gatekeep people out of engaging in a hobby, especially one supported by a company that wants to make profit, which means selling more product.
I remember the days when e.g. metalheads would beat up unworthy posers. Alas, Roguey is right. When it comes to our thing here, showering them with ridicule on an obscure forum is the best we can do. That boat has sailed away when we didn't team up to forcibly kick out MTG players out of stores dedicated to tabletop RPGs.