I wouldn't participate in this because it clearly devalues the industry.

People this may be aimed at:

* Experienced devs in boring day-jobs who are seeking some kind of off-time challenge.

* People just getting into ML and want to solve something real.

* CS students with spare time.

You know more about ML than me, but it doesn't sound like they're looking for a cancer cure; just fishing around for a one-off challenge. Or maybe they're taking names for future interview candidates.

Developers who are considering participation in this, I'd suggest you build something for yourself with data acquired elsewhere.

Relax, dude. If people think this an interesting problem to solve, what's that to you?