> AmpMe app can sync audio across multiple phones. (I was also really surprised to find out that they're a pretty huge company with 20 full time employees.)

The owner is a sketchy guy that made his money using adware (and still is) named Wajam.

I guess AmpMe is what he hope will be his legit way to make money. Until it happens, it's probably bleeding money and is founded by his adware company.