I've had a problem with domain registration when I purchased a .com and they asked for all kinds of business licenses and asking what the purpose of the domain is. Obviously I was shocked as they have no right to ask for the purpose of the domain and I explained that this was not for a business but for a privately administered website.

My registration was being denied again after back and forth with support, without a refund as well. I eventually had it escalated to their legal team and they were able to clear the issue up and offer me an extension on the registration for the hassle.

I'm happy that they corrected their errors and there hasn't been issues since, but that type of process was beyond what I'm willing to go through as a customer. I then registered a very similar domain name using one of the largest providers without any incident.

Edit: Does anyone have a recommendation for a registrar that just completes the registration and doesn't "flag" domains or ask silly questions?