There are no building “limits”, and I’m willing to bet that whatever message you got from Funcom, if it was in English, it didn’t say “limits”.
Abuse of claim system, maybe, or abuse of building mechanics or building system. But not limits, because there are no set limits.
As Funcom repeatedly clarified before, the rules are not about crossing a fixed numeric limit. The rules are about the impact of the build on other players’ gameplay experience. In other words, Funcom tries to judge what you do with your build, rather than how much you’ve built up. And they tend to focus on that in the reports they review, too.
There are several reasons why a report doesn’t end up getting the target clan banned. It could be auto-closed because Funcom didn’t have enough time and people to get to reviewing it. When that happens, you get an e-mail stating that – including an infuriating bit of verbiage that suggests that the problem might have “solved itself on its own” – and you’re invited to submit another report if the problem persists.
It could be that the report didn’t include enough – or any – relevant information. Funcom already clarified that this seems to be a pervasive problem with reports:
Finally, it could be that they reviewed the report and didn’t find enough evidence to corroborate the claims, and also didn’t dig up anything else that seems bannable. If you’re submitting a report, you should know what to report.
People have been banned for foundation webs and other forms of claim spam, for fence foundation stacking (back when it was possible), and for blocking a POI from being discoverable and other forms of content blocking, among other things. If your 50,000 pieces between 10 people were used to do any of the above, and whoever reported you knew how to point that out, it’s not a surprise you got suspended.
It sucks to be banned, but people really need to start figuring these things out. The complaints about how the “rules are vague and unclear” lose an additional bit of credibility every time someone comes here to insist on how they didn’t build more than N pieces. The rules don’t mention any building limits, and anyone who has actually read the rules should know that.