Question about people having several accounts

Some things are hidden in announcements because CG isn't updating the FAQ when he makes a change, but most stuff should be there.

You can also load your profile, click the 'member' in the top left, and scroll down to the bottom of that page to view site suspension criteria.

And yes, multi-accounting is a well-known issue, though given the nature of it, it's something you primarily come across in very low level public giveaways [as such users primarily have a single high level account and just making farming (usually bot) accounts for level 0~2 to support that account].

While such issues do lead to a permanent site vacation, it's worth noting that just a basic SGT filter (without any rule criteria set) does by default filter out giveaway leakers (due to the site maintaining it's own list of banned exploitative users), many of whom are suspected multi-accounters. Exploitative users seem to avoid even empty SGT filters as a rule, perhaps due to how thorough said filter is, perhaps due to the difficulty of logging their multiple accounts through it, or perhaps due to their entry habits mostly being related to giveaways which can be accessed automatically [by bot accounts].

In any case, whenever you're in doubt, report to staff [and SGT's staff, if the issue occurs when using an SGT filter]. They can decide if it's worth their time or not and, from what I understand, they do internally flag users they deem meriting of concern. They won't take action against a user unless they're certain of wrong-doing, and they won't get upset at you for bringing a concern to their attention.