With 1 million users all doing this, it's 3.2GB. 100 seems like a reasonable middle-ground between "that's a lot of storage to address a rare edge case" (e.g.

With 1 million users all doing this, it's 3.2GB. 100 seems like a reasonable middle-ground between "that's a lot of storage to address a rare edge case" (e.g. say this was 3.2TB) and "most people will never need 10".