4. Google forces its developers to use its infrastructure, which wasn’t developed for small social projects
One of the advantages of working for Google is that you get access to this infrastructure. At times I wish Google would start offering a raw BigTable service alongside/instead of the richer, but, limited App Engine services.
6. Google’s engineers can’t use any Facebook integration or dependencies like Instagram does.
I don't know if such a policy exists, but it certainly doesn't seem to apply to projects like YouTube which integrate fine with YouTube.
7. Google can’t iterate in semi-public.
If anything, Google have proven that a large company can iterate publicly. I can't think of a single other company that has had as many perpetual betas as Google...
P.S. Corrected link to Instagram: http://instagr.am/