Your account is rate limited. We rate limit accounts when they have a habit of breaking the site guidelines, getting involved in flamewars, or posting a lot of low-quality comments. You have a long history of doing that on HN, unfortunately. And are still doing it, unfortunately.

Rate limits apply to all posts, both comments and submissions. That's the technical answer to your question.

We're happy to remove rate limits when people give us reason to believe that they'll use the site as intended in the future, but unfortunately, when I skim your recent posts, I see reasons to believe the opposite.

I realize the throttling is annoying, and am sorry about that, but it's one of the few crude software-based techniques we have to try to dampen the degeneration of this place; something to which you've unfortunately contributed more than your share.

If you would review https://news.ycombinator.com/newsguidelines.html, take the intended spirit of the site to heart, and build up a track record of abiding by the site guidelines, we'd be delighted to take the rate limit off your account.