This is an interesting question. When you get interested in something, it's sometimes hard to track back what got you interested in that. So I'll try to be as precise as possible when describing how I got into the My Little Pony: Friendship is Magic fandom.
As with the furry fandom, it all boils down to computer science. 2016: I was watching French YouTube creator ElectronikHeart and he was making videos that featured FiM content[1, 2]. This can be considered my first contact with the MLP FiM fandom, but I didn't really care about it back then.
2021: Musician Kennyoung made a music video with musician PrinceWhateverer, a brony artist ; this was my second contact with the FiM fandom, and this time it got me somewhat interested.
Then, joining rooms such as The Tulpa Alcove led me to meet people from the FiM fandom, or just people who knows about it. Yeah this time it got me really interested. On December 28th 2021, I do my first steps in the fandom, and it was indeed successful!
I like My Little Pony: Friendship is Magic, I like the characters; and I like that the fandom is so devoted to be happy. So I don't care about what you think, I just want to be happy.