Riffpedia has a better article[0] then I could write, but the TL;DR is SMoD used to try to do DMCA takedowns against over stoner metal Youtube channels, as well as running a pay-to-play (as in, the bands pay to play) festival for a couple years. The latter being the bigger issue from what I've heard; stoner metal ain't exactly a well paying genre to begin with, the fact the SMoD basically makes money off uploading other peoples albums (he keeps all the ad revenue) and then makes bands pay to play in his festival was widely seen as a "dick move".

[0] https://riffipedia.fandom.com/wiki/Stoned_Meadow_of_Doom