I wanted a service that would not require to sign up with my phone number. Email is fine, I have a couple of aliases.

Can I use matrix for this?

The very worst offender is Nissan. The Japanese car manufacturer admits in their privacy policy to collecting a wide range of information, including sexual activity, health diagnosis data, and genetic data — but doesn’t specify how. They say they can share and sell consumers’ “preferences, characteristics, psychological trends, predispositions, behavior, attitudes, intelligence, abilities, and aptitudes” to data brokers, law enforcement, and other third parties.

From Mozilla’s findings

What you mean syncing with Gnome app?

Worst thing is they are collecting info on what people do in the car. Here is an article on Nissan monitoring sexual activity inside car.

Avoid Gecko-based browsers like Firefox as they’re currently much more vulnerable to exploitation and inherently add a huge amount of attack surface.

By GrapheneOS. Might they be wrong?

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Understandable