The CuBox-M measures just 50 x 50 x 50 mm and comes in two variants. The NXP i.MX 8M-based machine supports Android, Linux and can be used for machine learning or natural language processing, among other things. The CuBox-M starts at US$99.
https://www.notebookcheck.net/CuBox-M-A-tiny-mini-PC-that-supports-machine-learning-natural-language-processing-Android-and-Linux.519736.0.html
$160 for an A53 mini computer? that's April's fool material...
Where are the limits? I think people is smart enough to understand that a LarkBox is way way faster than "this cube thing", if not, the world is doomed...
And no, if you specifically want an ARM you also have plenty of boards way faster for half the price.