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[yurinka]

Why?
Allowing PS+ Streaming via Portal would bring more people into the Playstation eco system. Those people would need to pay for PS+ Premium, which is what Sony wants. And they might even buy a few games, which gets them even closer into the eco system. And they probably need a running subscribtion to play the games they purchased, so Sony can pay for the servers.
These are people, who are using Playstation hardware to pay for a quite expensive Playstation Subscription and buying Games from the Playstation store for the same price as owners of a PS console. If everything works decent enough (Image quality, latency), Playstation might make plenty of money of those users...

I do not see why Sony would not want this.

Yes, pretty likely Sony wanted this but apparently they didn't have the Android client of PS cloud gaming on time for the Christmas season where they had scheduled the device release and marketing campaign. They had the cloud gaming of PS5 games on time at least.

It's fair to assume they would be working to bring cloud gaming to mobile/tablets/tvs (+PS Portal) next.