Strange to mention Google Docs, which does work offline.
Weak sauce. It's true that Google's ad servers "track" you, but so do Microsofts. They will also allow all sorts of third party companies to track you too, via the real time bidding platforms....
You should have mentioned how notifications are actionable too.
Spotify has a web based interface now as well, so you can use it on Linux and your favorite OS, ChromeOS ;)
It also seems to include apps I don't have on my phone as "matches". I have no idea why NextTag or TripAdvisor was show as matches since I have neither of them.