Google is emerging as a major rival in smartphones to Samsung
I don't think so. The new GooPhone is aimed at Apple customers.
Google makes money TWICE from Samsung:
1) Any licence fee to use the "Blob".
2) Android reporting to Google.
As one of the largest (or largest?) and flag ship supporters of the official Android ecosystem, why would Google want to damage Samsung or the Android brand (by association). My conspiracy theory is that Google was taking these videos down, not Samsung via DMCA notices. Samsung isn't Apple or the Thai Government. Then Google (or the minion that had acted without higher up authorisation) realised this was counter productive. Better to join the laughter than pull a Streisand?