I'd be curious to know how it did on Twitch. Youtube isn't as popular of a gaming live stream platform so Sony would have more competition on Twitch.
Same. I know that MS beat Sony on Twitch the last several E3's before Sony became a no-show at E3 in 2019, even though MS had their own competing platform with Mixer (which also got a fair many views). Worth noting that Microsoft's E3 slot was at a more favorable time for EU viewers than Sony's slot though.