Highly unlikely. HTTP latency is going to matter 1000x more than React. If anything you'd expect to see them sponsoring WebSocket libraries or something.
javascript, which i write every day and love, fundamentally can do what i’m talking about through shaders in webgl or webgpu but people generally reach for react, which is the performance bottleneck in the rendering loop i’m describing because javascript is fundamentally inefficient at graphics and why the technologies i’m referencing were implemented with javascript bindings in the first place.
i agree the network is important, but it is generally the last bit in a call stack for any given user interaction.
I'm talking overall page performance. A gambling site using React vs not is going to have an absolutely tiny impact compared to network latency. They're sponsoring this framework as an SEO play.
css is the most performant way to create interactive experiences
if gaming (gambling in this genre) sponsored react, their customers would use a more performant poker app. react can barely handle being reddit.