I had no idea! I'd switched from Kindle to Boox because Boox runs Android, which is more hackable, but if Kobo supports SSH, I'll have to give it another look!
It's busybox underneath so you can hack on it but you can't run full apps in the Android sense.
How do you like your Boox device?
I liked my boox palma a lot until its display broke randomly after 2 months in a soft pocket and now it's ewaste.
I have a Poke since 2022 because amazon deleted my library from my Paperwhite. Same functions, better format and I can buy my books directly via browser from Kobo. No more perpetual airplane mode. Also, tons of formats, not limited to awz or epub.
I've had a Boox Page for about two years now as a Kindle Oasis replacement (current model is Boox Go 7 B&W). I get a bit more than a week of battery life typically which is good enough for me. And most valuable is using the same third party/self hosted apps for sync with my other devices. I've haven't used the Boox native store/reader even once.