1. I used to consult (for two years) in the department of my internet provider that would have had to do the reporting to the people who would have controlled throttling and even worked on the speed test page at times and there was no project to do that.
2. There was evidently no known and talked about throttling project among the hundreds of techies working at the business.
3. This place would not have been able to pull off the coordination between departments required to do this and also keep it a secret, and I'm betting most Internet providers would be even more incapable of doing something so nefarious.
4. The department providing customer support would have had to be in league with whatever department providing throttling, however KPIs for the customer support would of course have been negatively impacted by the many people calling in to report negative bandwidth usage. Thus they would have had to be in league with another division of the company to make sure they underperformed and thus did not get good bonuses etc. That would be an enviable level of dedication I must say.