The issue with your take is that literally everything has a bias. But Wikipedia does what it can to correct for that bias. Any good media outlet will attempt to reduce their bias when possible.
Unfortunately, all too often people on the internet will see someone complaining "this outlet is biased, you can't trust it". Then those people get pushed towards some other source that does nothing to correct for bias with those sources sometimes being just outright propaganda.
There's a manga where that's the original premise, except the summoner immediately asks the demon to marry him instead