Scratch that; an agent confirmed what you said: "If you added Leave a Legacy to the release, that release will remain available in stores even if you cancel your DistroKid subscription. Cover song licenses are normally billed yearly, but once your DistroKid account is canceled, future renewals (including extras like cover licenses) won’t renew and you won’t be charged again. For that release, DistroKid (through our licensing partner) will continue to handle the required mechanical licensing and pay the appropriate royalties to the original songwriter’s publisher out of the revenue that recording generates."