Claim to be simply making yourself part of the group for the benefit of everyone. We’re all gonna be friends, this is good for you, you’ll see.
Use your position and resources to make yourself the defacto way to use the tech. Bonus points of you can make the average person see you and said tech as being one in the same.
Once you have gathered a high enough percentage of the users, simply make changes or take other actions that will cut yourself off from everywhere else, effectively cutting off those users from anywhere that is not you. Since most of them are already “your” users, barely any of them will even notice anything change, let alone care.
Repeat previous steps for any new competing service that covers along to threaten you.
Their goal is pretty standard affair.