I wouldn't use this anywhere near my money site, they even say that themselves
Where have you read that?
They said, the Google Indexing API was primarily developed for time-sensitive content like news, but they haven't seen any issues using it for other content as well.
I'm using it for more than a year now, and haven't faced any issues whatsoever. Other members who used it for a longer period of time reported the same.
Looks like I remembered it wrong.
Anyways, I haven't heard about someone getting deindexed or something like this, because he's using it.
Dmm!!. They started pushing it without any warning , now when a lot of us are using it, they pulled rug under your feet.