This isn't personal on their part. It might be a bit rude but if you're going into the corporate world, get used to that. Just move on, if you're sitting there stewing about getting "ghosted", you can be sure they are not. I don't think it would bother me any more than getting a templated, cliche rejection letter.
It's less about the feelings going around, and more that the hiring committee managed to meet, decided against a candidate, and then the recruiter can't be bothered to give a candidate a canned "no"? What does a recruiter do? Doom scroll on Linkedin for $70k/yr?
Yeah the recruiter could spend some time preparing and sending communications back to all the candidates who were interviewed and then rejected, or could spend that time working on finding candidates for other positions he's trying to fill. What is he going to be incentivized to do?