With subscription you don't own the product, but also you don't pay up front.

With subscription, you should be able to buy as many months as you want. With extended warranty, I think companies usually only sell 1 extended warranty per item.

(I'm pulling the prices out of my ass, don't try to calculate which one is more "worth it".

Extended warranty:

30€ for the mouse (3 years warranty) 5€ 1 year extended warranty.

You are sure to have the item for at least 4 years. After that, you can use it until it breaks.

Subscription:

1€/month

You get to use the mouse for exactly the months you paid for. No more, no less

Also, with subscriptions you are likely to get a second hand item. But when you buy the item you are gonna get 1st hand unless you shop at Amazon.

I personally wouldn't buy a subscription, I prefer to own it. However, I'll admit that it's not black and white, and subscriptions also have some benefits.

Another way instead of per time window is per use. For example, in the case of a mouse, per clicks.

So if you buy 1.000.000 clicks and rarely use the computer, you get to own the mouse for a very long time for very cheap, just in case you ever want to use it. This is basically today's planned obsolescence, except the item doesn't become trash, the company would just reset the counter and you or the next client can keep using it. If you use it a lot, it's going to become real expensive real fast though.