If you don't renew your subscription to That Pitch, all libraries that were added during your Pro membership will remove your music. That Pitch will stop collecting royalties for those work(s) for you as well. (Your membership fee covers these services… it’s a lot of work on our side and we gotta keep the lights on ! 🙂.)
The subscription is billed on a monthly or annual basis from the day you sign up (depending on the plan you choose.)