my organization currently contains 15 github users. 2 of which are used by error reporting tools to open bugs (Sentry, Crashlytics), one of which is used by Jenkins, 3 of which are outside contractor for which github now will get the money multiple times as companies move to the same billing method.
We had 9 repos on github (and about 20 smaller ones with less collaboration on a self-hoste gitolite installation), so we paid $300 per year.
Now I have unlimited repos of which I still only use 9, but now I pay $1300 per year, whereby 3 of these accounts I'm paying for aren't actually real people and another 3 of these accounts I'm paying for even though multiple other companies are also paying for them.
Aside of the nearly 5x increase in price, I think it's also unfair having to pay for practically unused bug-reporting-only accounts and having to pay for accounts that are already paid for by a multitude of other companies.
I don't think this is good pricing for me.
Also as this isn't just a moderate increase, but a whopping 5x increase, I also strongly consider moving back away to a self-hosted solution because increasing the price by 5x is breaking the trust put into github as a third-party provider.
Increasing the price a bit is fine. But 5x is excessive.
Maintaining a gitlab instance is kind of ridiculous vs $300/yr.
On the other hand, its not exactly rocket surgery and $1300/yr would probably cover it.
So its not a theoretical issue in an isolated abstract sense but market position issue. The competition isn't the employee lunch fund but is actual competitors.
Aside from maintaining your own instance, I have no experience or contact with them but githost.io offers quite a bit for less than $100/month.
This will affect enterprises - but then they're either already on Github Enterprise or are used to per user pricing anyway. Google Apps, Slack etc all have (quantitavely similar) per user pricing. Google doesn't charge you based on the number of emails you send, nor does Slack charge based on the number of private rooms there are - that would be dumb.
The band of companies between small shops and enterprises are likely to be affected, but then this is really employee lunch money.