I get why you might feel that way. Ryan and Michael used to run a company based around React training. They created React Router which some people love to complain about. They've since moved over to working for Shopify. Shopify pays for their development on React Router/Remix. They do NOT sell training anymore.

Kent on the other hand, worked with them for a short time. He makes his living selling training. Filling in a gap (selling training) isn't really a grift is it? The dude's got a family and he's found something he can sell.