Nobody's reached out to us, and I don't think they will. Some good points have been raised already: it looks like it's aimed at AAA games, particularly the kind of games that are a 50GB+ download and require a $2000 PC to play. With Stadia you can still get to play such games on a cheap low-end device, and without having to wait for a colossal download. Construct 3 already excels at making lightweight, high-performance HTML5 games, which still load fast and run well even on cheap low-end devices. So it's already great for that kind of casual gaming. Putting that behind a cloud game streaming service would likely actually make it a lot worse, as
Keyo pointed out:
Why in the world would they allow the streaming of a Construct game if the streaming would easily surpass the game download size itself in seconds?