Few things,
First a lot of people see hive-engine tokens like "main" tokens and that using hive to buy these tokens and burn them is same or equivalent that burning hive.
Lot of things are not sustainable on hive, i think there isnt much profitable projects on hive because most of the project can run on proposal pay and posting rewards ect. Thefore these project dont need to find a funding or a way to sustain them per exemple ads are almost a forbiden word on hive but in practice it could help project build sustainability a lot of games use the reward pool as a way to fund them selves because they can do it and it easyer than fiding an idea on how to make sustainable, each time i though of project (never done them bcs of lack of skils) but i tried to integrate sustainabilty in it.
In the end its up to each of us to know what is okay or not, reddit posh is seen as bad by some. I think its great, you curate good content even more if it is seen outside of hive (maybe 15$ for a reddit share is a lot but it acts as a motivation for people to share there post too so its fine). Btw i think the hbd shop is bad, using the reward pool to reduce the invoices of poor people has no utility for the chain except dildue some hive out of hive (not like they will buy hive token hold) the day the discount end they are gone