I bought an HP in March 2020 when my job went remote and HP bricked it remotely after only 100 pages because I wouldn't sign up for their subscription program. Ended up trashing a perfectly good printer.
Luckily my library's close by and I can print there remotely.
A quick search for open source robot mowers pointed me to this: https://openmower.de/
As for Oomwoo, they're still working on assembly instructions, so I wouldn't immediately jump in unless you're fine with a lot of tinkering. Also, it looks like right now they're only considering parts kits, not fully assembled bots, and that seems to be a future add.
I personally still think it's cool and will be keeping an eye on it