wg-monetization Status Update 2021-06-21

## What was accomplished
**Amp monetization**
- Top sticky ad validator change
- 3p Vendor splitting launched to 100%

**Story ads**
- Starting story experiment for auto advance

## What's next
**Amp monetization**
- Web interstitial ads performance considerations
- Deprecate `<amp sticky` with empty sticky attribute

**Story ads**

