Those are "normal". They appear on some systems, do not know the exact reasons but they also don't seem to matter anyway
Hm, looks like it's somewhat different for everyone. At least there were reports it's running ok.
Unfortunately yes, the account has to own 7dtd. If not you would not even need to enter any account data at all
This might change in the future if TFP release a server only build which could be downloaded with anonymous access but that's not for sure.
Regards,
Chris