As of that date, 6 people made over $1M total since it launched (not per year). So maybe 1 or 2 have hit 500k in a year? Some of those names have been doing it for over 6 years.
According to a previous report, only 0.3% have made over $5k in their lifetime on the platform.
https://duo.com/decipher/taking-hype-out-of-bug-bounty-progr...
And I'd hope we are only one of their many clients. We might be an outsider though, my company does very well to address the bugs that are brought to us fairly. We understand the need to encourage the top 100 researchers on the platform an incentive to look over our stack. That's where the value is.
We do get a lot of spammy notifications too which sucks but it's part and parcel with the issue mentioned here. We leverage BugCrowd to help filter the chaff from the precious metals. :)
Unless you’re talking about private exploit sales, which is totally different.