I'm kind of curious how they've tackled the multi-armed bandits and early stopping problems inherent to A/B testing but so far I've only found that they use som

I'm kind of curious how they've tackled the multi-armed bandits and early stopping problems inherent to A/B testing but so far I've only found that they use some form of Bayesian statistics using unknown priors and likelihoods (except when you pick binomial I suppose, though the prior is still unknown). They seem to allow filtering drilling down by various categories, which would make statistical significance even more of a concern.