They have. It's called bypass-paywalls-clean . It works pretty ok.
It just keeps getting banned from the addon catalogs because of complaints from media. The Firefox one was taken down by a french newspaper. So you have to sideload it, which is hard to do on Android.
Hmm yeah but their adversaries did achieve their goal by pushing it away from the mainstream sites. Now we're into this situation of "how much do I trust this vague Russian site with my browsing activity".
At least the addon declares the sites it's for and ignores the rest but still I'm a lot less comfortable with it. It's more something I'd install in a container now, limiting its usefulness :(
It just keeps getting banned from the addon catalogs because of complaints from media. The Firefox one was taken down by a french newspaper. So you have to sideload it, which is hard to do on Android.
Edit: it looks like even the github was taken down now: https://github.com/iamadamdev/bypass-paywalls-firefox
But yes it exists. And it works for most sites. It's just hard to get it now.