I've seen similar stuff happening when trying to block spammers. I worked for a major publishing company and we had an issue with the comments, too many spammers. After a review it has easy to see that 90% of the ip address came from India, blocking India was an easy fix although it is unfair for good citizens.

Google your office IP address, maybe it got listed on some spam forum and GitHub and others used it.

Given you have sponsors, this is a pretty big mistake on their behalf. Probably just a mistake, hope they restore your account.