Bitbounce.io prevents spam. You can whitelist those that are allowed to email you for free. Everyone else gets bounced with a message stating that delivery can be made ...but with a crypto fee.
Tim Draper bought 10% of the company before the ICO. I don't think the owner, Stewart Dennis, would let him buy anymore.
Today was the ICO date. Read more about it at bitbounce.io.
Here's how to invest in the ICO:
https://medium.com/@stewart_dennis/how-to-participate-in-the-credo-ico-627e02d26058