Example:
Mozilla, the organization behind Firefox, is proudly non-profit, non-corporate and non-compromised. Will you help us work for a free and open Web for all? If everyone reading this chipped in $3, we would be supported for another year. Donate now.
Does that mean the same thing as uncompromising?
No.
Non-compromised and uncompromising mean different things.
Uncompromising means being unwilling to compromise, usually with respect to quality or ethics. A craftsperson who is willing to work with only the best materials and reject any flaws may be considered uncompromising.
Non-compromised as used here likely means intact or unbroken. I think of it as an opposite to compromised which means something isn't functioning optimally or as intended. An example of something that could be considered compromised is a computer that has been hacked.
Even to a native speaker it's not 100% obvious what they're trying to say here, except that it sounds cool. Non-compromised would likely refer more to this definition of compromise:
1. a. To expose or make liable to danger, suspicion, or disrepute: a secret mission that was compromised and had to be abandoned.
b. To reduce in quality, value, or degree; weaken or lower: Don't compromise your standards.
As opposed to uncompromising, which is an unwillingness to cooperate. Mozilla makes open source software, so accepting money from corporations would, to them, compromise their reputation.
