All my shit is in the Google ecosystem. I am fairly confident that Gmail is not going away anytime soon. However, I am more afraid that some obscure ToS violation will forcibly disconnect me from their ecosystem, and I will have to scramble to make sure all my contacts have my alternate info. I am doubly screwed, as a Google Fi customer. If we all get suddenly degoogled, I lose a phone number that I have had for over 20 years.
As good a deal that Fi is for me (I normally don't use bandwidth unless I travel internationally), I may switch soon just to reduce my exposure to Google.
This is why I’m migrating off Google to a custom domain. I have no fear Gmail is going away, but I fear if they ever block my account for some inscrutable reason there will be no way to appeal or get actual customer service.
Fi isn't that great. We were on Fi for years; I switched to Mint, my wife stayed on Fi until I was sure it was going to work. So far, I pay less for more, no gotchas.
It was amazing when it first came out; now it has a lot of competition that beats it.
I haven't tried it yet, and I haven't had a reason to look into it. My experience with Fi was that you pay $10 per Gb - it didn't come out of your normal bank - and per-minute charges. When I was traveling, I used my company phone, or if on vacation, purely data with heavy up front-caching as much as I could at the hotel. I really don't like surprise bill sizes.
But to be honest, I haven't tried Mint internationally, so I can't say.
Some years age when I was still using some more google stuff (like an account for calling out from my PBX) I had each service assigned to its own google account to limit the impact of google doing something crazy to an account.
Apart from playstore youtube red is now the only service left - and that's about to go as they now made it too expensive, especially taking into account that they enshittified it so much that we've blocked it on the TV, and "adfree on TV" was the main use case there...