Unity toon shader causing object flickering

Is Unity Toon Shader future proof / Can I use it in my commercial game?

I wrote a tutorial for toon/cel shading (link/source in comments)

Learn To Use Shader Graph To Create Awesome Effects In Unity

Your Ultimate Guide to Shader Graph for Beginners

🖼️ Want to tint objects in your Unity project? Find out how to use Shader Graph for colorful magic! 🎨 #Unity #ShaderGraph #GameDev | GameDev.tv

Unity Toon Water Shader Tutorial at Roystan