There's a lot of misconceptions about rights.
A site's 'mods' or admins are the parties responsible for determining whether such rules have been appropriately adhered to.
If they have not there will be an accepted [by the site] procedure to address that.
It looks like in your case you must have transgressed said stated rules sufficiently to have your further access denied.
Life's like that. You do wrong...you get a slap.
Calling such mods/admins 'gestapo' is neither rare nor original and decidedly NOT creative. It is the bane of all rule makers/umpires to be called that or worse, no matter what facet of life's society it entails. 'Kill the umpire"..."referee's blind", etc.
Call them Gestapo if it makes you feel better. It won't change the situation other than to reaffirm [in their minds] that the correct action was taken....