He wants to try before accepting the deal.
I don't know if there exists such a thing as GrapheneOS account, but it is not required. You can add Google, Facebook or other accounts like with regular Android. I use a self hosted Nextcloud instance to synchronize contacts and calendar with DavX5 app. GrapheneOS has built-in apps. I use most of them. For the app stores I mostly use Fdroid and Aurora store for non open source software. I don't use Google play store even sandboxed because I don't accept the terms of use, mostly because they have the right to uninstall apps from your phone without consent or notice.
Some like Phind or Perplexity cite their sources. And they give you directly the answer you're looking for without having to search it in a mess of "subscribe to our newsletter", "other articles that may interest you", 3 paragraphs of "if you read this article, you will know what you want to know", "special promotion for you",…
And pay in cash
A few years ago, I've read an article where the journalists investigated this. They asked to Facebook it they actually do it and Facebook confirmed.
Hundreds of partners is very common in news paper sites
Close the app and find another one.
Does it detect the paywalls and cookie walls too?
The model is open source, but not the whole site. It was made to help in programmation, so sometimes it makes funny answers when you ask something that has nothing to do with programmation and it tries to answer giving you a Python code.
This functionality can be local. I use the Google keyboard with internet access blocked and it works. The only thing missing is the ability to search for emojis typing a word (they are still in the list) and some features that I never used and never understood why they are in a keyboard since it's not related to typing text, like the gifs.
The only reason I see for a keyboard to need internet connection is to update the dictionary when it's modified, but it shouldn't prevent to work with an outdated dictionary.
When I searched for alternatives a few months ago, I couldn't find anything satisfying.
What's the problem with 2G?
And there is still the 14 eyes agreement