Terms, terms, TERMS people. I can't believe that with 40+ comments there isn't more discussion of the terms.
It could have been $100M in Google stock on a 4-year vest, plus $25M cash on a 4-year earn-out. At those terms, it's really only a $25M deal if the founding team doesn't think they're going to sit around at Google for 4+ years.
Basically, the one sentence above tells us very little about this purported offer and the reasoning for turning it down. I would wait a week for more details to emerge before jumping to any conclusions about bubbles, co-founder betrayal, or anything else.