There is so much in algorithms that we can't really understand and know.
I [quite recently] made a topic here about something like this, but it was in a "reverse". What I mean was, randomly and suddenly Instagram had started to recommend a model's REAL account (she has no FAKE Instagram account) to me. It caused some drama between us because (understandably) she thought I had gone searching for her. She said she uses completely different emails and phone numbers (and obviously a name) from her cam name and real Facebook/Instagram, yet somehow, it still managed to recommend her real account to me.