[agwa]

In the case of .org, non-uniform renewal pricing is only allowed if "the applicable registrant expressly agreed in its registration agreement with registrar to higher Renewal Pricing at the time of the initial registration of the domain name following clear and conspicuous disclosure of such Renewal Pricing to such registrant"

So Ethos wouldn't be able to screw over existing registrants with non-uniform renewal pricing.

Source: Section 2.10(c) of https://www.icann.org/sites/default/files/tlds/org/org-agmt-...