All I can say, is that you have lot to learn.

For starter, you can educate yourself on different international groups who check media agents for trustworthyness and political alignment. One does not need to be a genius to know its possible to judge these things.

For instance, biased media channels will use loaded words and frame situations in a specific way. And you can count these situations, and score it. It is all a matter of methodology.

If you dont believe this can be done at all, by no person or machine, then you can not even trust yourself to judge the media you consume by yourself.

Since, what methodology are you applying that is better? You should introduce it to the world, and help us out.

I dont think that BBC is that biased (at least in comparison with other sources). Check a bias in media website to see. For instance,

https://www.allsides.com/media-bias/media-bias-chart

Deutsche welle is quite good, and it is funded by this tax. Dont know abiut the other channels, since I am not a german speaker.

Well, here in Germany, every household pays a tv tax of 18 euros. This goes to media channels, including news. One of the purposes is to decrease bias.

Perhaps there are studies checking the efficiency of such a measure.