There's a standard (ActivityPub) that everyone follows. But honestly, in the beginning, I just installed all these platforms on #YunoHost and tried to put the pieces together to be able to communicate with everyone ;) It also helped that I have a small footprint on Lemmy, and I have been following its development for a long time.
Popular Reddit App Apollo Would Need to Pay $20 Million Per Year Under New API Pricing (forums.macrumors.com)
Are Lemmy and Kbin ready?...