As far as I know, things like that have been happening for a long time on this forum, where the same name is often used by other members.
As I discovered a long time ago:
Topic: The name is the same as, staff, monderator forum.Mod names, Admins and other members are not immune from imitation of the same name.
Including my name has also been imitated.
YOSHIE345But as long as members know and provide a warning on the profile in question, I don't think it's a threat to certain members.
If forum wants to apply this rule of banning users with similar usernames, some few hundreds of accounts would be banned. I have come across numerous usernames that imitate reputable members including the forum admin username is imitated. The only thing that is clearly visible to differentiate the real users and the imposter is the account rank and activity.
Newbies are likely to fall victim if they choose to pull a scam because they are likely not to pay attention to obvious parts. They mostly focus on the username. Unless, there's motive behind that, I see no reason why someone deliberately choose a very similar username and deliberately made a little modification when there are several usernames available they can choose from.
Why can't they think of something unique as username? I personally prefer to stand out from the rest so I would vote yes if forum wants to stop users from creating a similar username.