Ouch, sorry to hear that Frank. If you remember, can you leave a comment here again when they lift the ban? It looks like it might be for two weeks.
My upload is dreadful so I’ve only uploaded around 1,000 images, and with Backblaze running too hopefully it’s slow enough that it won’t annoy them. Having said that, a colleague at work uploaded tens of thousands of images without problem so maybe it’s a random thing Google does. 🙁