It's advisable to generally avoid .ml comms because they're authoritarians (see below) in addition they'll ban for simply mentioning "ricing", not sure why, think they view it as anti-China or something
But for what you ask
Why boycott .ml?
Don't link to or participate on Lemmy.ml, join the boycott today! because the admins of .ml (and many users) (known as "tankies") authoritarian ideologies they push, their critical support and defense of horrible countries like NK and Russia no matter what they do, the related propaganda they push (For example they constantly push the idea that Ukraine deserves to be invaded because Russia is the good guys actually (Russian propaganda)), and the censorship the .ml instance admins (see megathread link above) perform to keep it that way
Some highlights from the link:
Dessalines, head .ml admin, lead Lemmy dev actively spreading genocide denialism https://sh.itjust.works/post/61371958
.ml admin, Nutomics continued transphobia https://lemmy.world/post/29222558
The original transphobic Comment from Nutomic: https://lemmy.world/post/18236068
"If you don't support Russia then you just don't understand geopolitics" ~dessalines, .ml admin, dev https://lemmy.world/post/27352415
"Don't worry guys, the Uyghur Genocide was REALLY just birth control! ~dessalines, .ml admin, dev https://lemmy.world/post/30580167
"See! nobody died IN Tiananmen Square, just AROUND it, so it doesn't count!!" ~ Davel, .ml admin
https://lemmy.world/post/30673342
"NK is actually good and anything counter to that is Western propaganda!" ~dessalines, .ml admin, dev https://lemmy.world/post/31595035
General negative sentiment to other instances who haven't "seen the way" yet ~davel, .ml admin https://lemmy.world/post/27426510