The MicroPython pyboard is a compact electronic circuit board that runs MicroPython on the bare metal, giving you a low-level Python operating system that can be used to control all kinds of electronic projects.

Literally the second paragraph

Yep, I see that now. When I bought my first pyboard theirs was the only one. It's great to see how it spread!

Imo, arduino is also mostly a software project nowadays. While they did make a bunch of avr boards that were quite novel and interesting at the time, now they are not as good in terms of both price and performance compared to various arm-based boards.

What keeped arduino alive is a bunch of libs and arduino ide cores for various boards ppl have written over time.