The real question is why does the app require an email address at all?!!!
There is no technical reason - those Plug'n'play home video cameras work perfectly well by just using the serial number of the device to connect (usually by scanning a QR code) - no information about the user at all.
Anyone providing their email address to a dildo app in the first place is not thinking straight. It is obvious that their real purpose of collecting that information is for some other monetisation.
We used to call that blackmail.