When Norway recently moved to tax funding state media, I think they solved this by making it a completely separate dedicated tax. At least that's what was discussed, not sure about the details of the final implementation. So it can only be changed by a vote in parliament, which is more visible to the public, can take more time, and requires a majority of parties to agree on that specific change.
But otherwise, the “government” can always alter the tv license fee, or the tax. It’s always under their control, and changing its label doesn’t do anything.
Austrians public broadcasters, the ORF, are way better than that even. They mutineed against the attempt to install pulitical operatives at the head of the organisation. They even end interviews with gvernment secretaries if they don't get strsaight answers.
That is hardly a strong endorsement.
That being said, i fell like the state TV is the opposite. Only neutral news, facts without much of an opinion. For me it's not enough to follow the news since I can't be an expert in everything. I need voices from a certain my political spectrum that write what they feel about laws and processes. Environmental activists commenting environmental laws etc. Thats why I read the newspaper additionally. It's certainly not unbiased, but still independent.
Edit: When I say 'how' I don't mean 'why', I mean 'by what means'.
A notable case in 2009 was the contract as Editor in Chief of Nikolaus Beendet, which wasn't extended since Roland Koch didn't want to and went up to the Constitutional Court, which ruled that there was too much political influence at ZDF, leading to changed oversight, which still is close.
TlRecent case is the "coalition crisis" in Saxony-Anhalt, where the parliament blocked the new rates.
But it's complicated as bodies need some form of democratic legitimation and with the "Sozialwahl" we have one failing experiment of doing extra elections, aside from parliament elections ... where nobody knows who the candidates are and what they do ...
One other way is to have former press and spokes persons from a government taking up positions at the braodcasters. When the current (?) spokesman of Angela Merkal left as a news presenter from the ARD (or ZDF, to lazy to loo it up...),that was regarded as a braek from customs and more or less a no-no affecting the independance of these broadcasters.
TL;DR: Political parties, and not so much the "government", use soft power to influence these briadcasters. Quite often by having certain people selected for certain jobs.
Which other independent private business can just straight up charge you without you signing up for their service beforehand?
In Germany and I guess, in most countries, the public broadcasters are basically low-key propaganda arms of the government. The whole separate tax thing is a intermediate smokescreen to give the public the illusion of independence.
It is protection money: You haven't ordered any service and if you don't pay they'll make you pay and ruin your credit score in the process.
In the collection process they pretend to be a government institution to avoid going through local courts, which sometimes are against them.
EDIT: Also, I'm beginning to wonder why any criticism of the German government or especially state TV is being downvoted here. Civil servants have a lot of time ...
IIRC it's Capita who collect the money and keep a remarkably high proportion of it. They're also employing people to lie and intimidate to try and get access to homes.