[bdb]

You're seeing this because that's where Comcast primarily buys transit and peers with other networks; those edges are where the congested ports are. They generally have plenty of capacity between SV1 and their CMTSes (even if they have to take you from Oakland to Sac-town to get from SF to San Jose).

[bifrost]

Comcast has been horribly congested in the SFBA for months.

I believe they've been looking at offloading that congestion and frankly moving Netflix is a no brainer.