@Arceus To be perfectly clear, I understand completely the problems the Portuguese server is facing, and I hope they can be resolved. I wasn't at all trying to minimize the situation. It's indeed quite unfortunate that one person can create a mess for everybody, but that's the problem of smaller platforms ran by volunteers.
However, the solution you proposed is ineffective. A user cannot post twice in a row, but only in the same topic. That does not mean they cannot post twice in multiple topics across the forum.
Even this inability to post twice in a row is an extremely unfortunate limitation, and I have been negatively affected by it in multiple situations, without trying to spam anything.
From my side, I suppose that the only effective solution could be that every new user is placed on some kind of moderation period. This would mean that their forum messages would first have to be approved at the start, and after the moderators feel like the user can be trusted, i.e. no multiple accounts and such, the user can gain the regular poster status. The real question is would this already make the lives of the moderators difficult and would it require them to be a lot more active on a daily basis?
From my perspective at least one person must monitor the forum in any case to prevent major problems, so probably not that big of a difference, but this is only a user perspective.
Anyway, hopefully the situation will improve in the near future.