It is supported by LineageOS, at least[1]. I have been using one as a daily driver for the past week, and though the hardware is nice otherwise, the band support in the US is poor.

1: https://download.lineageos.org/beryllium

Here's how I look at it:

Google - Wants my data, willing to play the long game, has the scale to properly support security updates

Third party US manufacturers - Wants my data, playing the short game, suspect UI choices

Chinese manufacturers - Wants my data, suspect UI choices, unknown motives with regard to data privacy

Open source OSs - High data privacy, absolutely controllable OS

Weighting between the 4, my threat model prefers a Google phone, despite the privacy downside. Google does creepy things, but ultimately they don't really care if a power user turns off tracking: they only care if everyone turns off tracking.

There's also this company called "Apple" you might want to look into, if privacy is relevant to you. ;)

No root. I prefer owning things to leasing them.

You have to trust them, though.

They sayy they care about privacy and yes, they make most money on selling devices and not on advertisement, but who guarantees that is not to change any moment?

And aren't they allready in the advertisement buisness as well? So also have a motive for getting and evaluating all your data?

Is there actual evidence of wrongdoing on Xiaomi's part? If they're abusing my data it should be trivial to verify by MITMing my device. Can you point to someone who has done this and found something?

Forgive me if I don't take your word for it. There's been a lot of anti-anything-that-isnt-america news going around lately.

Anyhow, as another poster points out, it has LineageOS support, which is what I use.