Dataset difference

While ml model differences give you 1,2 percent, dataset differences give you 10,20 percent. Unfortunatelly, second one is not publishable.

Keras model save

if you compile again model before saving it produces much small h5 file. I think it removes gradients.

Software Rot

Cloud software rots much faster, even if you do not have to change anything. They add new authentication mechanisms and new machine types, and things break more easily than before.