Every LN transaction contains info (description) of where you spent the sats.
Even though login is optional for WOS, Most users will still prefer to login with their email to have a backup, if they lose their phone.
And there are many number of data they can collect, which might include IP address, Device ID
Thanks for the answer. The collect and sell data, I already implement in the question. However, I'm starting to realize that I should have written in more detail. Is the answer really: the whole thing is a pure data collecting and selling machine? Is there no information on actual numbers?
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