The glue goes with the battery, and there is probably a few patents on this magic glue, so generic battery manufacturers will be prevented to be able to add this glue to the new batteries they will want to sell.
I would guess that not original parts which could work get refused by the app?
Batteries being perhaps the only exception, and even then, the battery identification chip and flex cable is original apple, just the cell is switched out.
So generic battery manufacturers could presumably buy the tape from Tesa, license production themselves, risk producing their own variants, or supply replacements without electrical debonding (the consumer probably doesn't care that the replacement battery doesn't use the same debonding tech their original battery used).