Yeah many are definitely being done by the same system or group. The thing that sucks is that AFAICT they are always on behalf of real businesses. If they were all misplaced or fake I'd have no problem just wiping them out en masse. But I just hate to straight up delete a node that's a real business with real info, only issue being the tag format. (I hate to punish the unaware business owners and miss out on real data for OSM, I mean. The marketing companies, however, can kiss my ass)