What do you mean? It can stream them, it just doesn't have any PC games that it streams that are not also on PS3. In order for Sony to limit the stacks of PS3s it needs to have in giant warehouses to provide for PSNow streaming it would make a lot of sense for Sony to stream PC versions of games (at settings roughly similar to PS3 settings) that are multiplat with a PC version.
Whether PSNow will ever stream PC games not released on PS platforms is a different matter, but it would only be a matter of licencing. Aside from MS published games I imagine Sony could easily get streaming licences for many back catalogue PC games if Sony wanted them.
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