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Seems like there's no ISA slot.

Other than nostalgia, XT/AT compatibility, DOS and ISA slot is still one of the major reasons to do this, to still use old expensive hardware that requires an ISA card and DOS software for interfacing.

It's emulating a IBM PC on a cheap micro-controller.

The fact that all this is running on a ESP32 that costs ~10€ is mind boggling.

To support the author of FabGL you can buy his own boards:

https://www.tindie.com/products/fabgl/fabgl-esp32-33v-board-...