To quote the immortal Gregory House M.D. — “Everybody Lies.”
Whether it is outwardly to create an appearance we would like people to see (dating profiles, most peoples Instagram account, Facebook posts, etc…) or to themselves (books have been written on this) — everyone lies to some degree
Bu at the same time you are correct, we leave a trail of digital detritus that can be analyzed to get at the “real” you. Retargeting is a form of this — I search for something — therefore I have intent to buy it, visit it, etc…
No reason music data wouldn’t be an excellent marker for a dating site.
Would certainly make initial matching a lot easier.