Realistically, if all of the TPA-users quit, Reddit would not notice such a huge difference. I came from Reddit and used RIF for like 10ish years, and not going back to Reddit now. Most users don't care about the API change other then that some of their subreddits where down for 2 days. TPA combined had like 15(?) million users (on android) and the official app had like 100++ million users?