I'm no longer with the organization, but it had:
* Hundreds of open-source contributors
* Millions of users, mostly paying
* Zero direct competitors using the software. With equal ground for technology, it'd be almost impossible to overcome first-mover and branding advantage unless the organization really messed up
* Hundreds of major open source users doing interesting things with the software and using it in non-competing contexts. That translated into product enhancements.
With GPL or BSD, it almost certainly would have played out as lots of competitors doing an extend-and-proprietize, and instead of a successful open company, it would have been a dead organization.
So many misconceptions abound.
The flip side, though, isn't that everyone should use the AGPL. You should have the right license for the right context.