I can understand how you feel, Karin, I also value my privacy. That said, it isn't necessary to stop using your Fitbit, just disconnect it from the app so it isn't sending info back to your phone and/or computer and Fitbit (soon to be Alphabet).
I actually have two Fitbits, one connected to their app and the other not. Either one will tell me the info I want, but I prefer to use the one that is not sending my info back to Big Brother, LOL
Newly