I don't understand this take. If government forces these companies to have age verification and they can't say no, then this can be applied to any of these counter-examples given too; Matrix, IRC, etc. There is no difference between forcing a single entity vs. multiple entities. If the punishment for non-compliance is high, no-one will risk doing it anyway. There is no escape here.
English is the international language. It is mandatory to learn it as the second language in most parts of the world, even places you never heard of. It is especially a no-brainer for a person who grew up in Germany(which is one of the most developed countries in the world, and definitely has the means to educate its own people). Again, this is a problem of choice. And since Germany is a country that relies on importing educated people to keep its economy afloat, choices like these are self-sabotaging.
This isn't an english-speaking-forum, its an international one. That is the reason English is being spoken.
I get why the French is still angry about this issue and refuses to speak English, since it isn't French that is considered the international language, but English.
I wouldn't expect a French to understand this though.
Because even in countries less developed(by western standards), there are more English announcements, so visiting tourists can also use the public transport. This isn't lack of speaking the language as well, it is more about not wanting to speak another language because "In Deutschland muss man Deutsch sprechen." It is reaching French level of racism at this point. Funny for a country that wants to attract so many international expats.