Google Ventures kicked in maybe $200K from all of the research I've done, which, while no means is chump change, is chump change for Google.
I wouldn't follow that as any source for a trustworthy platform.
My research from Venture Capital Post, CNN Money, et al sources indicates that the 3.5 million came from Core Innovations, Venture 51, Camp One Ventures and IDG Partners.
Additionally, an undisclosed amount of seed money came from Google Ventures, Lightspeed Venture Partners, Andreessen Horowitz, FF Angel, Vast Ventures, and The Bitcoin Opportunity Fund.
Yes, the Bitcoin Opportunity Fund also.
All of these organizations vetted and scrutinized Ripple to the nth degree before they just handed over their money. THAT makes it about the most trustworthy investment going in terms of potential for growth.