Current count is now over 200 accounts banned, mostly but not limited to Chesapeake and Siege Perilous.
Those are the facts. Everything else is rumor. And there are lots of rumors, mostly around duping and profiting from same (moving things cross-shard similar to what KoC was accused of earlier). Others think Origin is just targeting reds. To a man, everyone who was banned professes complete ignorance over why they were banned.
Origin at this time has said nothing. If that changes you’ll see it here.
I have no doubt there will be more on what, if nothing else, is the largest mass banning in any ORPG.