It still doesn't take a team that large.

When I was at Facebook they decided to re-write Messenger in C. There were people who thought it was a waste of time. There were people who thought it was a great idea. It was a lot of work, took a while, and I wouldn't be suprised if by now it's been re-written to something else.

It's not that hard to make up work, and there's people whose whole job is pretty much just that.