What is the difference between owning software and renting it?
Software ownership is not only about its license or price. A useful test is how much it depends on a service, account, activation check, or file format that someone else controls. Fewer external dependencies can give you more durable control, though hardware and operating-system changes still matter.
Nobody sells you the software itself
When you buy software you are almost always buying a license to use a copy, not the copyright in it. That is true of a one-time purchase and of a monthly one. So the word ownership on a checkout page settles very little, and arguing about it settles less. The useful question is not what you hold title to. It is what has to keep happening, elsewhere, for the thing to work.
Who decides whether it runs tomorrow?
Two questions separate owned from rented, and neither is about price. First: if the company that made this disappeared tonight, would it still open in the morning? Second: does anything have to stay switched on somewhere else for it to do its job? A tool that survives both tests is less dependent on the seller. A tool that fails either relies on something outside your control, whatever you paid.
The test is easy to run at home. Put the device in airplane mode and use the thing. What still works gives evidence about local capability. An error can reveal a network or account dependency, but it does not by itself identify every system involved.
When the test fails, the failure takes one of a few shapes: a server doing the actual work, an account gating the features, or a license check phoning home before anything will start. The shape does not change the verdict. A monthly account and a one-time license check are both, in this sense, the same fact: something you do not hold still has to say yes.
Perpetual license or subscription is not quite the same line
Billing and dependency often move together, but not always. A subscription can cover software that computes entirely on your machine, and it will still stop on the renewal date because a check says so. A one-time purchase can carry an activation server, and when that server is retired the copy you paid for can refuse to start.
So the honest answer to perpetual versus subscription is that it depends on what the code does when it cannot reach the network. Read that behavior rather than the pricing page. An offline installer, a file format other programs can open, and no required sign-in are the signs that a purchase is closer to an object than to a tenancy.
What owning software still cannot promise
Ownership is not immortality. Hardware ages, operating systems drop old interfaces, and a program built for a platform that has moved on can stop running without anyone deciding to end it. Owning software means no other party's decision is needed for tomorrow. It does not mean nothing around it changes.
That is why formats matter as much as licenses. Work stored on your device in a format other programs can read outlives any single application. Work that lives in an account fails with the account. Durability depends on choices that leave people with control over their own work.
If it needs a server, an account or a check to run tomorrow, you are renting it, whatever you paid.