I don't know about Samsung but you "pay" Google/Amazon with your personal information and their services are all designed to be loss-leaders for their online advertising and/or online shopping business. Apple's pitch for a subscription would have to be "ad free, totally private, impartial and designed for the benefit of users rather than advertisers"... and they'd have to follow through with that.
I can't see myself wanting such a service - but I'd also rather not have to pay for a "free" service indirectly via. hardware costs. The acid test would be "save me more than $20/month worth of time".
Subscriptions are not a bad idea per se - when the nature of the service is that it genuinely requires central servers and continuous updates. Many "AI assistant" tools would fall firmly into that category. The problems come when a product is unnecessarily made dependent on a web service (with or without subscription) and/or updates are lacklustre due to lack of competition/lock-in or only needed because of buggy, (fr)agile code that breaks with every OS update...