Whatsapp, telegram and Minecraft are centralized, so there’s no way to have a two-way communication between someone on one of those and someone on the fediverse, whereas with the bridgy bridge it speaks native activitypub and native atproto and acts as the gobetween. There is not anything like this for any other type of bridge I have ever used. Now something like this could indeed be done with Matrix and there have been some attempts at this but I still haven’t seen any of them work in practice