Just my 2 cents worth :
Threat - technology - always difficult to secure the high ground and stay there for ever. I guess Sergey's sentiments have spilled out.
Openess - the more globally exposed media is, the more likely it is to conflict with the localised regulators and court jurisdictions. I guess Sergey is expressing his frustration at Google's potential to loose opportunity.
Business is always going to squeal if it doesn't get most of what it wants. Double standards here as business also wants openess and access, without Google's commercial interferences [ just not possible, unfortunately].
Users are always going to make noises if they feel their privacy is compromised.
Unlike Microsoft, i think Sergey has a concern over an impending set of inertia's and some cross winds. Somethink the size of FB with a capitalisation the size of China decending across Google isn't going to be without a few ripples.
Ultimately, these digital giants are going to run foul of the masses at some point, which lobby or involve the authorities, so they need to be sensitive on how they handle this, and the basis lies in truth and a degree of balance - if it can be achieved.
Hopefully progress, and the conduct of these business' won't fan the flames of anger which seems to be prevailing in a lot of areas. We need more harmony in these dealings - call it a " popular cause" that everyone wants to be a part of, rather than a perception of greed , control and commercial enslavement, which got Wall Street a bad name in 1998 after 20 years of financial abuse, that's left a scar on many folks.
It's not a perfect world - but at least some improvements in the communication and transparent intent would help to build the balance and global / business / authority buy in to "openess and access".