No need to register, login or install anything - there's a bookmarklet on desktop and the PWA app on Android allows you to add bookmarks from the share menu. The extensions work on Android with Firefox Beta/Nightly, Mull, Fennec, Kiwi browser. You can connect to multiple bookmark stores, share bookmarks from one store to another and switch between stores easily.
A demo store with bookmarks: StoreID: store / StoreKey: 12345
Not only Kindle. There are e-readers with Dropbox integration and RSS is still widely used. My own scenario (no matter phone or computer):
- I come to a page I want to read later, a page behind a soft paywall, a page with a "switch off your add blocker" popup, page with tons of JS, popups, videos that takes forever to load and one has to close this and that while scrolling down
- It takes one click (2 to 4 taps on mobile) to send the page to web2doc and forget
I read the content directly in the web channel or (1)Feeder reminds me about the new article(s) within half an hour.
I am ashamed to advertise it so bluntly but I wrote a similar tool that might address some of the above requests. The browser extension works with all desktop browsers, Firefox Beta/Nightly on Android (that's how I use it) and with Kiwi Browser on Android. The IOS shortcut has only been tested via appetize.io. There's a sort of sync - RSS and a dedicated web page. Bypasses some paywalls and most ublock/adbock blockers.