Many times they actually have restrictions / rules for recruiters that they can't re-contact or re-ingest prior applicants even if its for a role in a different

Many times they actually have restrictions / rules for recruiters that they can't re-contact or re-ingest prior applicants even if its for a role in a different department (like eng -> product). I'd say if they ghost you and they aren't a massive company they probably aren't professional enough to really pursue further and likely would just be a bad place to work in general. I honestly take more offense to rejection letters that claim "we'd love to stay in touch!" or something with similar ingenue bubbly language.