Reddit is removing the Direct Message feature, and all active conversations will be archived so you won’t be able to continue ongoing conversations. Reddit also deleted all bad reviews for their app awhile ago. Its rating went from 3.4 to 4.5 stars overnight.
My conspiracy theory is that big social platforms like Instagram and/or Snapchat are behind the change, because the P in PM is for Private and they are fundamentally against privacy, as they profit off your data, including likely analyzing your messages to serve you more relevant ads.