As with its Trust Store Mozilla operates in public. If you believe that providers aren't behaving you can and should present evidence to the community.

Mozilla isn't suggesting you choose services based on how cheap they are, but on whether they implement these policies.

NextDNS, who are on Mozilla's list, offer a paid service if you want advertising filters or porn filtering or whatever but if you're damn sure you "get what you pay for" then pay them their subscription fee and don't switch on any filters.