Time to Talk does not collect any data. Time to Talk has no server backend, it only operates on the users device.
Time to Talk does not require the user to register an account. In fact, Time to Talk does not even support user accounts.
Time to Talk records short audio clips (fractions of seconds) into Random Access Memory (RAM), but these short clips are not stored in persistent memory - as soon as they are analysed they are deleted from RAM. Analysises of these audio clips are made in real time, which means that the recorded audio clips are deleted within matters of fractions of a second.