I don't think he is popular, he appears in popular shows and is shared across youtube/instagram alot

I checked his TikTok profile, he don't get a lot of views

https://www.tiktok.com/@tate.0fficial

For comparison his instagram seems way more popular:

https://www.instagram.com/cobratate/

And similar, it's more views on youtube:

https://www.youtube.com/results?search_query=andrew+tate

It's more like a youtube superstar at this point

They even picture him as "the new Alex Jones"

https://www.youtube.com/watch?v=Uq4cDv2cUoE

Youtube is the root of the evil