It's also free and built-in. Also, it isn't quite true that this functionality is missing as it is provided by the full Office 365 offering (Office 365 has a fully featured wiki).

Teams wiki is simple, because it's tied to channels that are frequently transient. Regardless, I wouldn't bank on any long-term advantage from having these features. MS could drop a Teams update tomorrow and render your entire business case moot (either by adding those missing features, or changing the API in some detrimental, to you, way, or making their offering better than yours).

I hope you do well, but .. you're directly competing with a core functionality (provided for free) in Teams. And that's a tough spot to be in, short-term and long-term. If you want to make a business from it, I would explore ways to pivot.