I don't know if it's "most" but there are (still) a lot of apps with one-time purchase. You never saw that in an Appstore?
I bought quite a few around 2012, sure, but it tapered off. I don't think I've bought any apps as one-time purchases in the past five years, it's all yearly subscriptions now. All the ones I see on my main phone screen right now are subscription-based or free.
What are some well-known apps sold as one-time purchases now?
THE top paid app in iOS App Store where I am (which isn't US nor EU) was an ad blocker built by one guy, for past two straight years. I think it's an unspoken open secret that App Store has been dead for a while, with apps that use App Store as mere payment processor e.g. freemium lootbox and subscription apps, notwithstanding.