It seems very much intentional and it happens on the desktop as well. It isnt entirely consistent when it happens but it can take as little as a few minutes until it triggers the notification of account creation.

It sees Google credentials and then auto creates an account that you can change the name on. I keep deleting them but reddit keeps making them. I just gave up and kept u/redditisastupidhead as my minor protest.

It was the final straw, I now just avoid the place altogether. It is like having a preappreoved credit card turn up in the mail, it is trying to suck you in. No thanks!