Depends on the sub: in my experience, some subs were just plain more picky than others, and the reasons didn’t always map to a published rule. I was actually temporarily banned from one sub for posting something fairly innocuous – or so I thought. That was my first and only attempt to post to that sub; I promptly unsubscribed and never went back.

As to whether or not lemmy is “better”… we can hope. But if we assume that the issue is caused by humans who are fallible, (or by code that humans wrote, which is by extension fallible) than I’m afraid the source of the issue isn’t particularly likely to change with the platform.