Wouldn't it be more efficient to send imaginary data instead of completely blocking telemetry? Blocking your own telemetry data results in Google collecting jus

Wouldn't it be more efficient to send imaginary data instead of completely blocking telemetry? Blocking your own telemetry data results in Google collecting just a bit less info about you. They can still make decent profile about you from data they collect from other user devices. On the other hand if you poison the well you compromise other user data as well. Detecting and filtering out invalid data takes time and effort and by the time it is detected the bogus data has already been replicated and used to drive decisions. BTW would it be legal to inject bogus telemetry?