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raspberrypi-sys-mods
A collection of Raspberry Pi-sourced system configuration files and associated scripts
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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.
Second, adding a third party repo to a "stable" distribution after the fact is a Big Deal. The way they originally did it gave Microsoft the ability to install arbitrary things on your machine. Even though that's been "fixed", now that the foundation has proven itself to be staffed by untrustworthy scumbags, you should be concerned about the Raspberry Pi foundation having the ability to install arbitrary things on your machine.
If you read the first sentence it says the license for the code is located here which looks like the MIT license to me.