Hi,
I believe my colleague misunderstood what you were saying. UpdraftPlus does not contain any mechanism for removing functionality in the currently-installed version when you no longer have an active subscription; you can keep your installed version forever, and there is no code in there that locks features if you do not renew.
If for some reason your pCloud uploads no longer work for you in the Premium version, that is not because of any such mechanism in UpdraftPlus. Unfortunately, though, it is the case that you cannot access our paid support channel if you are not an active customer, so the only way to investigate why you were having a problem is if you become a customer again in future.
David