Not sure if it's a locally run model or in the cloud. If it's the former they don't explain the size on disk and more importantly on memory. I know that google is using local models on the pixel phones, so it's doable. If it's the later, the "Mozilla don't keep the data" is hypocritical and I'm perplexed by the cost associated.

In any case as a french, I prefer my personnal data be exploited by a french compan :D