Now imagine some poor developer stuck with TFS or Visual Source Safe right at this moment trying to convince his line manager to change to the "overpriced insecure [non-standard] solution."
For enterprise, decisions on what tools are used (or shortlisted) are almost always made by those who don't use them thus why it is important to manage perceptions. TL;DR - enterprise is broken.
Perception is actually everything, it turns out. :-(
There might be a few users who were already frustrated and switch on their own, but I think the big problems are an ongoing spearphishing risk and a bruised ego.
This wasn't "spam" it was an accident email send. Things pretty much every single giant website has accidently done at least once.