"Has Reddit tighten its rules recently?"

Ohhhhhh the irony...

People saying that reddit is a leftist echo chamber, when it's

a) not "leftist" at all, but yanks have no idea what the Overton window has done to their world view

b) saying that nazis are bad will get you permanently banned and device blocked

Elmo has achieved his goals

yeah maybe stop commenting on reddit. its a whole ass internet out here... try it.