Super interesting! Do you know the kind of data that it's usually used for? And in the remaining 80% to 60%, do NNs acccount for a large portion of the best models?
Bonus question: are the stats you're mentioning publically available?
Sadly (but correctly) nothing is public, no one ever sees any data, it's a service. Pure FNN (feedforward NN) models, if I recall correctly is also ~30 to 40%.
Since the server doesn't work for all types of data, and probably folks that are experts in ML would do their own hyperparameter tuning, and custom models, this leads to the bias on the type of datasets that are compete.
But this share have been consistent over many months of various unrelated datasets, I believe.
Bonus question: are the stats you're mentioning publically available?