Mass DMs aren't a normal thing really. The IG and TG things were far more the exception rather than the norm. Mass DM'n was a thing like 10-15 years ago but most sites and networks have rate limits in place that make it pretty pointless unless you had some extremely fresh or targeted data because you won't be getting many messages out before getting banned/locked. Usually when people find those methods they keep them to themselves to bank. I'm still kinda confused as to why anyone shared the IG method to begin with unless they just didn't know what they were doing really and got lucky when they found it. Lol.