Then you could make that argument and say all piracy isn't theft even without the silly bit about "if buying it isn't owning"
Internet memes rumbling about fail at capturing complex interrelations.
Big problem when comparing physical
things(!) to immaterial …well…
not really things.
That is the reason something like
copyright (and related: patents) had to be invented. The simple(?) rules about legal status regarding physical property cannot be applied on intellectual output – the latter being easily
copied without taking away the original.
In colloquial expression it is clear why many say "piracy = theft". But it is in fact not the same thing, because theft actually means taking something away. Similar would be fare dodging: Nothing gets stolen.
Piracy is not theft. But still illegal!
If renting a car is not owning
Then stealing a car is not theft
5 million IQ logic
Problem with digital storefronts are their 1000 pages of fine print ("TOS") you absolutely and actively agreed on after understanding every juristic expression and trick (which most lawyers will not be able to).
They use the word "buy" for immaterial works… and then try to hide the fact that buying is not guaranteed that the immaterial product will be available for you permanently.
Renting or subscriptions are something different. And this is sadly becoming the norm regarding software (for example – hope to remember that correctly – Adobe Creative Suite cannot be bought anymore)
The juristic implications ("What may legally be [hidden] in TOS?") will vary among different jurisdictions.
If they use the word "rent" or "paid subscription" and mention a time limit
before payment it is okay. If they say "buy"… well it will better be permanent without any loopholes.