this has already been said, but due to the fact that this is google you have no idea when it's going to get killed and most things from google get killed. so i would suggest AWS. API Gateway + Lambda. It's basically free for side-projects and the setup + operating it is trivial. It also scales (and you're going to have to shell out real money) if you were to receive a lot of traffic.
Just the other day I wanted to buy a book, but Amazon no longer has it in stock... Yes, that makes about as much sense as people who can't get over their favourite RSS reader, 13 years on.
if it was just the RSS reader, nobody would bring this up. Reader, Inbox, Wave, Plus, NestAPI, the list goes on. Here: https://killedbygoogle.com/