Can they see what you are hosting on that port, though? Like say I want to open ssh to my server from the internet (I wouldn’t do this, btw, and I don’t recommend anyone does), but I don’t want to open it on port 22 because that’s too obvious. Are there bots that just try every protocol until they find one that your server responds to? Or is there a way to dig up information on what is being exposed behind that port?