Reddit join fediverse ? And let anyone crawl their massive data, user generated content for free ?

Never. Reddit need that in IPO.

In fact I use Xiaomi. Is it bad ?

Oh, Apple give in for fucking Winne the Pooh.

I use Android, luckily.

How can they censor Bluetooth?

If you self host an VPN, meaning that the outbound of your VPS/machine you host VPN can be checked, as least, what IP it connected.

So, you got to buy VPS from foreign country, not in mainland or hongkong

I love is third world country. Free to pirate and government don't care.