Sure, I think it's probably generous from the user count point of view but incredibly limited from the number of files. And it seems you have to use provided fonts in the free tier... I think Rive should offer the Editor free like Unity and then charge for additional services like console support, dedicated support, troubleshooting, etc. as that's much more common business model for game middleware. The same applies to Unreal Engine where Switch/PS5/Xbox support is gated behind the respective access to the official dev portal and Epic's own Perforce rather than GitHub. And Perforce support for example should be promoted for pro tiers.

I see a banner mentioning "Rive for Game UI" which is great to see but really the whole platform should be a Flash replacement. It shouldn't just be for doing UIs in games or animated content, it could be used to make full 2D games. Flash was so popular because of its versatility. There were middleware taking Flash content directly into game UIs (ScaleForm) and there is middleware supporting WebKit for game UIs (Coherent labs). Both of these have extensive scripting support (respectively ActionScript and JavaScript) allowing UI designers and coders to create reactive and flexible content, even procedural content like lists of things etc.

By the way, the only way from mobile to get to the downloads link on the main site is only behind the online editor login. I get why but I thought at first that the Editor was online only because of that.