People that were not placed into Gymnasium at age 8 are set on a course where, once they turn 18, do not get to go free Uni; they simply are not allowed to go to Uni at all!
Also the problem of cost of living while studying isn't exactly trivial. Accommodation, food and participating in general student life all are things that cost a lot of money. You will need at least 1k-1.5k EUR net per month, which means earning 2k or more gross. That's not exactly easy to do on the side, since most degree programmes are full-time only; you are expected to put your 40 hours a week towards the degree and not some other job to finance yourself.
When polled, 87% of students answered that they were dependent on financial support from their parents and 12% received state-sponsored loans [1].
So let's not kid ourselves. The question of whether you will go to Uni or not, in Germany, also depends to a very large degree on who and how wealthy your parents are.
Statistically speaking, your chance to go to Uni is 27% if your parents are blue collar workers. It is 79% if your parents also hold academic degrees. If your parents have no professional training at all, the probability is 12%. [2]
So maybe we should focus on our own issues first ;)
[1] https://www.sueddeutsche.de/bildung/studienfinanzierung-so-k...
[2] https://www.forschung-und-lehre.de/lehre/nichtakademiker-kna...