Yes, people can set up multiple Bambu accounts and some even openly admitted they don’t have a Bambu printer and not planning to get one but they come here to post their opinions anyway. So requiring that the forum shares the same Bambu account hasn’t stopped these activities.
However, I think officially requiring the same account for the forum makes it hard to justify suspending or banning anyone, or at least make it more complex to implement the suspending or banning.