I think you are running afoul of not realizing that "world class" neural networks are a ton of code. Just as a trivial SAT solver is easy and can be implemented rather quickly.

Now, neither will be that good at the job they are made for. But that is far from unique to this field. Consider, a car/bike/house/whatever is not exactly hard to build for backyard use. Getting world class, on the other hand, escalates to difficult very quickly.