I think one scene that has really helped this wave of especially rotten-sounding death metal is the Danish scene, and all-too-often forgotten and ignored community; in particular, one band: Undergang. Undergang has been around for a while but with how much they've been touring the States and the lineups they've been on (especially with ultra hyped bands like Spectral Voice and Blood Incantation, but that's a conversation for another day), I think they've really gained a lot of traction, and they certainly exemplify overly-putrid OSDM. Maniac frontman David Mikkelsen has his bloodsoaked fingers in every possible orifice of the scene as well: running Extremely Rotten Productions, helping organize Killtown DeathFest, doing artwork and logos for bands, the guy's a fuckin' madman. If there's any one person responsible-ish for propagating this "movement" (I guess), it'd be that fuckin' guy.
Overall, Denmark has always produced bands that tend to favor raunchy, swaggering mid-paced riffing, and impressively deep vocals, which while I can't really verify that it's had any kind of influence on the current state of things happening, I can't help but find parallels, so let's dig into Denmark's history a bit. Everyone knows the mighty Iniquity and their masterpiece, Serenadium...
...but how many people know the sorta-side-project, Swollen? Incredible riff structures here, top notch song writing.
Members of Iniquity have played in about ever other Danish band in existence (they were like a Danish Sinister for a while hahaha), including but not limited to Thorium:
Eciton (huuuuuuge, swaying grooves here too)
Corpus Mortale
Konkhra
Some other really notable bands from Denmark's past include Illdisposed
Usipian (this is an all around incredibly tight album, fans of Morbid Angel, Suffocation, Immolation, stand up and be counted)
I could go on and on, Detest, Ferocity, Lustration, The Cleansing, Dreadlord, Dominus, Infernal Torment, Feticide, Panzerchrist, etc., you get the point, it's always been sick. What really kinda brings this full circle is the fact that the Danish scene is rearing its ugly, deformed head once more, experiencing its own resurgence. Compared to the Pacific Northwest, however, this one eschews quantity for quality; they may not have as many bands, but I KNOW these are names you'll know, very talked about albums for their own respective years. Such as Phrenelith, who also feature David Mikkelsen:
Hyperdontia (technically half of the band is turkish, members of Burial Invocation, Decaying Purity, Engulfed. another Mikkelsen project)
the aforementioned Undergang
Wormridden (yet ANOTHER DM band, this time he paired up with the guy from Anatomia in Japan)
Mold (last Mikkelsen band, I promise)
Sulphurous
Taphos
Stylistically, a little more varied, but definitely a scene on the upswing, and like I said, some definite similarities to be found. Conclusion next.