I mean…not curtailing leasing concentrates power with sketchy rent seekers and empowers the enterprises which use them (many of which range from “sketchy” to “evil and criminal”).

So I guess I’m having trouble envisioning a world without IP leasing that’s materially worse than the one we have.

Have you tried getting an ipblock from a RIR and failed? they seem widely available if you justify it and at a reasonable price. If not, you can always go to a host and buy at a smaller fraction...