It can help with location when you're on a device that doesn't have a GPS receiver. Like a laptop.

It might also help with initial positioning since it can take several seconds or minutes to get a GPS lock.

Edit: For anyone who want to contribute to BeaconDB there is NeoStumbler on F-Droid

I'm not sure why anyone thinks receiving GPS data is "bad".

If you're somewhere where GPS is frequently jammed (such as a warzone, etc.) then it could be useful.

Power consumption is way lower and satellite acquisition takes time (or you keep your GPS running and warm/hot-start, but that draws even more power)

I think it's more of "isn't this really cool" than "this is pratical to use". It's a proof of concept of a really cool idea.

it would help investigators if you get murdered