If people are unhappy with the cost of renting addresses from cloud providers, hosting providers or ISPs, they should be able to move elsewhere where such fees aren't
imposed on them. Most of these providers do have local, regional, or global competitors. If they aren't moving the service offerings are compelling enough even when there is a slight charge per public IPv4 address.
As for limiting access, again, there seems to be ample amounts of addresses for sale by various brokers. Yes, technically the fixed cost would be different between the upstart and the established player w.r.t.
addresses but does it matter? The one-time cost for these is significantly less than what an average cloud shop spends on Google ads and marketing per day to make itself known.
I don’t think the RIRs should meddle in the business models of the LIRs, either.