Weird, being this is a highly console-centric community, and a lot of people seem really excited for it.
And no, it will affect Sony and Switch to a real extent.
Switch now has a direct competitor, and Sony has been making more and more push into the PC space, meaning they only benefit from this.
If anything, MS benefits, because they are happy to have their gamepass streaming on any platform, are supposedly in talks with Valve on a sort of partnership, and have a number of their exclusives on Steam as is.
You’re looking at this ass backwards.