I can tell you I know a number of people who pay for Netflix/Amazon Prime/Apple TV+/Hulu/HBO/etc and then turn around and pirate the same content because watching it though Plex/other is simply a better experience.
And frankly, I 100% understand where they are coming from:
1. What platform was I watching show X on?
2. Oh Platform X removed show Y? Well it's also on Platform Z but now I can't remember where I was in that show.
3. Oh, every Platform has a different UI/UX? Great...
4. Internet slow today? DDOS against Platform? Guess I'm not watching anything
5. Oh that's right, Platform X only work on Set Top Box A or B but not C... Guess I'll just watch this on my Phone since I can't get it on the TV
6. Going on a flight? Going to be without internet? Don't want to stream it on cellular? I hope Show X is on a Platform that supports offline watching.
7. Paid service != No Ads, you've got to deal with Hulu's BS and/or pre-roll or self-promotion crap
I know Apple TV is trying to address some of these issues and so is Amazon Prime Channels but it's all a Russian nesting doll of terrible.
All of this stands in rather stark comparison to using Plex/Emby/Jellyfin/etc:
1. All my content in 1 place
2. Content never removed except by owner, track show progress across all clients easily
3. Constant UI/UX even across platforms
4. If you are local there is no lag, remote will depend on your own internet
5. Apps for almost every platform (Phone, Web, TV, Tablet, Gaming Console, Roku/Chromecast/Fire stick, etc)
6. Offline sync options
7. No ads, no pre-roll (unless you set a custom one yourself)