I already made one-time payments (aka "lifetime") for two softwares/services. Was great until the providers went out of business. Before that they treated me not so well in support. But, what should I do, end the contract? Now I have the strict rule for myself not to use any kind of one-time payment options in this area (software/software based services) anymore. I'm just putting this down here to shed light on the possible downsides.

Edit: now I realize this is not written clear enough. This rule applies to software/software based services I intend to use regularly to solve a specific problem, like office, storage, etc.