It is fair to say that funder bias is a significant concern in the not-for-profit world, including in public broadcasting.

There's been open mainstream speculation of that "PBS sold its soul" to the Koch Brothers:

As David Sirota, the author of the PandoDaily expose, wrote in its aftermath, PBS doesn’t stand for “Public Broadcasting Service” anymore. As it becomes more addicted to big-bucks donors, it risks becoming the Plutocrat Broadcasting Service.

https://www.latimes.com/business/hiltzik/la-xpm-2014-feb-17-...

Tiny Spark is the podcast of Nonprofits Quarterly, and has dedicated numerous episodes to the question of funder influence.

https://nonprofitquarterly.org/podcasts/

Ralph Nader, Noam Chomsky, and Robert W. McChesney are voices on the left who have called out corporate / fundraiser bias on the part of PBS, NPR, CPB, and other public broadcasters in the US. McChesney notes:

Public broadcasting today is really a system of nonprofit commercial broadcasting, serving a sliver of the population. What we need is a system of real public broadcasting, with no advertising, one that accepts no grants from corporations or private bodies, one that serves the entire population, not merely those who have high-brow tastes and disposable income to contribute during pledge drives.

https://www.lehigh.edu/~jl0d/J246-02/oligopoly.html

'NPR’s funding from Gates “was not a factor in why or how we did the story,” reporter Pam Fessler says, adding that her reporting went beyond the voices quoted in her article. The story, nevertheless, is one of hundreds NPR has reported about the Gates Foundation or the work it funds, including myriad favorable pieces written from the perspective of Gates or its grantees.' https://www.cjr.org/criticism/gates-foundation-journalism-fu...