rumble.com is a banned domain but is unbannable if you want. It looks like it is part of the list that is imported at instance creation. I don't know the first thing about rumble as a site, but that is why the post isn't working.

FWIW, even as a feddit.online admin, I don't see any comments on that post and it is showing two in the post teaser.

Alright, you sent me down a bit of a rabbit hole and I learned something about PieFed today because of it. Apparently, the downvote button isn't shown for a number of reasons, but in your case the reason it isn't shown is because users with a total "reputation" (upvotes received - downvotes received) that is too low lose the ability to downvote. Your reputation is currently too low for the downvote button right now.

Reputation as a metric is intentionally something that a user is unable to see. That is reserved for admins to help identify potentially toxic users. My guess as for the intention of a feature like this is to limit the spread of negative influence that a (potentially) toxic user can cause from extensive downvoting.

As far as I can tell, the only other feature that you are locked out of with a low reputation like this is the ability to send private messages (definitely a spam/toxicity measure). Other than that, your account is fully featured.

I see now. I will try to take a look into the code and see what could be the issue.

What options are you looking for? Controlling what downvotes to accept is not done at an individual level, it is either done instance-wide (blahaj disables downvotes for example), or at a community level by the community mods. This is the list of options that is available to them for their community:

Editing a user note is currently done via the user's profile page (in the More dropdown). I just tagged you as "Photon Dev" and now whenever I see your username, that will be diplayed alongside. So, now I see this in this community:

Currently, user notes are not exposed to the api (there is a codeberg issue for this iirc) and they don't offer a way to customize the colors (I don't think there is a codeberg issue for this one). You could use custom css to style user notes since they have the css class of user_flair.