It seems like someone is flexing the size of their account farm. Possibly they are putting it up for sale. Acquiring accounts & keeping their passwords is one thing; actually putting them to use is another. There's no way they will be able to do their thing undetected, whether its promoting some shitcoin or joining bounties, they've already been caught.
Yeah, with how stupidly the actors behind the farms are waking up accounts in batches. It makes it easier to link them. Fortunately, when I looked at the ranked up accounts that woke up at the same period, most of them are either already tagged for spreading malware, being hacked, cheating in bounties or even being already banned. The remain few that are clean can easily be singled out in case they try doing something stupid.