I'm new to the course, so haven't done much on it, but Crestle (https://www.crestle.com/) looks like a great alternative. Looks like they use Kubernetes to manage resources, but you can get a dedicated NVIDIA Tesla K80 GPU for about $0.30.
It also hosts your notebooks, and gives you a terminal window to install your own stuff. Permanent free storage.
Best part, you can launch a notebook w/o GPU support for just 3 cents an hour. Try things out, play around when it's cheaper. Then restart your notebook with GPU enabled, and train your model.
I'm not affiliated, just think that it checks all the boxes that I want.