Their firmware is open source. You can pay whoever you want to maintain it. You can't do that with Dell, HP, Supermicro, and the unknowable rabbit hole of ODMs and sub-suppliers and contractors who actually make the hardware and firmware for these companies.
Until you've dealt with a malfunctioning Dell or HP server and have to live with being told "we don't know why it acts that way, we'll try to get the ODM to repro" I don't think you can appreciate how cool Oxide's offering seems.