Xiaomi DNS Blocklist
Xiaomi devices (especially phones) are very chatty - imagine that your phone is able to exchange a lot of data with Xiaomi servers and their business partners, mostly without your knowledge. If you would like to close your smartphone mouth a little, here is a solution - a bunch of domains that you can block using Pi-hole, AdAway or other apps. The list is updated as soon as I notice that my phone connects to a server that is not available on that list yet ;)