I only had the chance to peek and after reading your comment, it sounds very plausible that general heating is a basic function. I'm sure i saw the seat-heating, in the lowest price subscription though. It must have been before they dropped the subscription for it. The paid air conditioning included air purifing with hepa and carbon filters and some iirc Plasmacluster Ion technology.

I should have been a little more specific ...

Even by not subscribing to the paid subscriptions he said he had to subscribe to the basic subscription, which enables the app.

It looked like they will also drop a random paid feature into the basic for a limited time, every few weeks another feature, so people get to test it. That's what the ad in the app suggested.

I didn't think about the one time purchase to be honest. I assume it to be featured in a submenu, to make it less prominent than the subscription, in order to get a bigger number of subscribers.