The SEC doesn't seem to overlook violations regardless of when they occurred.
I've never seen an action like this one before. It seems to be a new interest for them. Note also that they didn't just post a litigation notice: they issued a PR about it. I think they're trying to send a message to other issuers who've done the same.
Of the five companies, all settled for a $25K fine, except for IFXY, which paid $50K.