I am watching this with some interest -- I wrote about AROS myself last year:

https://news.ycombinator.com/item?id=44061609

It's a remarkable little OS, and it does have potential. The Pi is a lovely little computer but a bit underpowered for modern Linux or FreeBSD, let alone Windows.

But as RISC OS on the Pi shows, it's got more than enough power to be a capable GUI desktop computer, and AROS could make it into one of the fastest Amigas ever.

While AROS also runs on x86 of course, including x86-64, that is a crowded market: AROS is a small fish in a big pond.

However, on a 1GB RISC machine, it could really shine as a fast, responsive, capable GUI OS, open to hacking and experimentation, and able to run pretty much any original Amiga software under emulation at much faster than Amiga speeds.