Assalamu Alaikum,
In the majority of Proof of Stake blockchains, as they are in its infancy the rewards come from a combination of transaction fees aswell as a minting process. In the long term the rewards will be purely from tx fees, but in the early stage the majority of profits originate from new coins/tokens being printed - unless they have a 100% premine.
Does this change the permissibility at all?