In the UK, it is perfectly acceptable (even expected) that newspapers endorse a party or candidate.
In Germany, this would be unacceptable & tarnish the publication's reputation. A newspaper's task (& everyone's expectation) is correct & unbiased reporting.
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Yet, I don't believe regulating ownership is the answer. Domestic ownership, for example, doesn't guarantee neutrality.
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- a set of professional rules w/ clear guidance against bias & lies,
- a body to oversee it w/ the authority to step in on its own initiative,
- tools to sanction publication of misleading, biased or false reports
END