Of course it is forced, it has to be. What's the alternative? Make it voluntary, which immediately will lead to the total cost only being spread across sick people that definitely are going to cost the system money, resulting in an immediate increase in coverage cost, making it unavailable to a large part of the population? Just look at how well removal of the fee for non-coverage under the ACA worked in the US. That's just "let's take health insurance away from poor people" with more steps.
And there certainly is consent, given voters can choose to elect people who will change the system, or not.
"Solidarity" is a pretty good term for that abstract idea. What would you like to suggest instead?
And yeah, I understand that people that do not buy into the concept of a society pooling together such risk to create a model that works best in the aggregate instead of emphasizing individual choice are going to hate everything about this. If you want to be able to save money in exchange for taking on risk, such a society can't let you easily do that because it'll inevitably lead to a tragedy of the commons; such a society would also likely help you anyway if you made the wrong risk trade-offs and become a burden to the state.
Also, let's be clear: this principle is still very popular in Germany. I haven't lived there in a long time so I was curious and gave it 30 seconds. Admittedly the source here is an insurance carrier, but they found in a survey that while 66% of Germans last year were worried about insurance costs and the financial sustainability of the German healthcare system, 73% support the solidarity principle (https://www.aok.de/pp/gg/update/solidaritaet-gkv/)
It lets everyone, including those less well off, enjoy relatively low insurance premiums and you get personal mobility in return.
I’m well off, part of the reason I’m well off is because I was lucky enough to be born in a place that provided lots of stability and opportunity (schooling, health care, et al), it’s nice to give back. Sure, there’s flaws and waste in places, but I’ve had a family member go through extensive medical treatment because of cancer and I genuinely wish that level of care and options for everyone, so paying my taxes and health insurance premiums it is!
What is really fucked up about Germany, is that exit to private insurance exists in principle, and our Bundesmimose Friedrich Merz have never used statutory one. The existing system has deteriorated only because nobody in the government is using it and has no clue what people now experience daily.
its designed that way, no worries.