narwhalYour Fitbit is useless – unless you consent to unlawful data sharing
while it doesn’t support Fitbit models so it’s pretty useless in this particular case, try out Gadgetbridge. it does support lots of different smartwatch brands, and helps you keep all the data on-device without phoning home.
deafboyWorks perfectly with Mi Band 3. The UI is little rough, but you rarely have to use it after the initial configuration. Everything just works.