No idea why people are downvoting you. This is a very important question to ask when it comes to Google services.
I'm not the to make commitments but our history has been solid, and our deprecation policy is embedded in our terms of service for every Cloud user.
The only product I can remember us deprecating in GCP was Prediction API in favor of the much-preferred Cloud Machine Learning Engine, and with that came communication to every single affected admin and a _year_ before cut-off.
Unless one is twitter sized limiting ones exposure to googles arbitrary decisions is quite reasonable.
I can get a person to talk to at microsoft for my tiny account easy and I know neither they nor Amazon will just shut me down overnight.
It's not just the consumer side; Google doesn't exactly have a spotless reputation for developers, and assuming the post must be somebody faking being concerned for "Internet Cool Guy points" is just tone deaf.
The services that Google dropped were either big bets that ended up as massive failures in the marketplace (e.g. wave, google+) or services that were neither big nor strategic to google (e.g. google reader, google code).
GCP is neither.
If you're not convinced by the fact that Google has been pouring billions into Google Cloud for over 10 years now, organizes multi-day conferences promoting it, launches new features monthly, then no rational argument will convince you that they won't drop GCP because they also dropped google reader.
Sure. But this one little service inside GCP? Tiny.