Subscription models are devilishly tricky things when you don’t control the entire ecosystem end to end. It’s tough to implement. I don’t blame you for not going that route.
I don’t mind subscriptions for some things. I’m a Navigraph subscriber. And I’m also subscribed the the aforementioned Adobe CC suite (the whole suite, not just PS / LR). In other cases, like my MSFS add-ons, I’d much prefer outright buy them and own them (or at least the license to use them) in perpetuity. If someone is selling something I want and I consider it worth it to me, I have zero qualms about forking over the asking price for it. And I own several 3rd party payware planes, airports, enhancements, and others. Outside of a few products by some shady devs, I find the market for add-ons quite reasonably priced.
I’ve said it before and I’ll say it again - If someone releases a high level TBM 9x0 addon (with the level of depth and quality of the HotStart TBM 900 for XP) onto MSFS, and I’ll be all over that like white on rice, no matter the cost.