You can disable the anti spam filter in the left drawer. But yes, we will always block spammers by default.
The devil is hidden in the detail. Blocking spammers is of course a good thing and I don't want to switch it off. The issue is that in this case it created a false positive. That is the bug: a legit account was flagged. I personally would prefer to have a false negative every now and then if it would prevent this from happening.