I don't understand this sentiment that always pops up on posts about new Google services. Google allows you to download your data and take it with you, so if Google abandons the service, you can go elsewhere pretty easily. This is not the case with a bunch of other services I use, yet I never see such posts about them.
The data mining criticisms hold a lot more weight but only in cases where they collect more data than is necessary to run the service. That's why paying for Fastmail doesn't make any sense. You're still trusting somebody else with your unencrypted email data. In this case though, I don't see the value-add that Google provides in having unencrypted access to the fitness data. It looks like a fairly dumb data store, in which case most of the data can be encrypted with a user password before being sent to Google.
The data mining criticisms hold a lot more weight but only in cases where they collect more data than is necessary to run the service. That's why paying for Fastmail doesn't make any sense. You're still trusting somebody else with your unencrypted email data. In this case though, I don't see the value-add that Google provides in having unencrypted access to the fitness data. It looks like a fairly dumb data store, in which case most of the data can be encrypted with a user password before being sent to Google.