There is a growing quantity of requests for subdomain eTLD+ with aspirations of offering segmented customer namespace.

Given that registries are increasing the wholesale price of domain names, and the registrars are passing these prices through to the registrant, low-cost options are becoming attractive for hosting providers in order to serve their customers.

Low-cost options help customers start their journey, but unfortunately are also an area that can get exploited for bad things.

Question for the community:
SHOULD these subdomain registries be required, as part of inclusion in the PSL, to provide RDAP / WHOIS lookup server address such that it is possible to directly contact the specifically responsible party for a given subdomain?