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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I personally don't have a problem with them killing third party apps. Does Instagram, Facebook, Imgur, Twitter, TikTok, Discord, etc., allow third party apps? I honestly have no idea, but I assume they don't? I know things like BetterDiscord exist, but those are breaking Discord's Terms of Service (although they apparently don't use any API). From Reddit's perspective, these apps are stealing users away from their official app and making money off of Reddit, all while actually costing Reddit money. It just doesn't make sense.