Quantcast/Compete is almost no relationship to reality when you are talking about b2b startups or startups with sub-10M/month uniques. They are wrong in magnitude and growth trends as often as they are right, in my experience.
Also, if an investor DID block a sale, that fact would come up any time they were competing to fund future YC companies, so it probably wouldn't be worth it for an investor to do that... Yet another value that YC provides.
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Two thoughts:
Quantcast/Compete is almost no relationship to reality when you are talking about b2b startups or startups with sub-10M/month uniques. They are wrong in magnitude and growth trends as often as they are right, in my experience.
Also, if an investor DID block a sale, that fact would come up any time they were competing to fund future YC companies, so it probably wouldn't be worth it for an investor to do that... Yet another value that YC provides.