We've had this since the 1990s for higher education students. One of the known effects is that students who got it, used the public transport systems more often after wards as they were more familiar with it. I would not be surprised if Germany has a simmilar effect. The problem with these effect is they far outgrow the attention span of polititians as they take years to come to full force.
Most students now get the nationwide ticket for effectively about 30€/month.
So for students in my region this was never free and still isn't, you are forced to pay for it and can't opt out: https://www.studentenwerk-leipzig.de/mobilitaet/semestertick...
> Studierende der sieben Leipziger Hochschulen im Zuständigkeitsbereich des Studentenwerkes Leipzig zahlen den Beitrag von 176,40 Euro verpflichtend mit der Immatrikulation bzw. Rückmeldung zum Wintersemester 2024/25.
I think there was a provision of opting out if you needed a regular public transport ticket anyway to get to the uni (because you lived too far outside) but that varies by uni as well.
But hey, germany could never really decide, are they living in an authoritarian, left or right utopian la-la-land or in a free country. For some time the american influence was huge, but i fear, the influence will diminish and the pendulum swings again.
So students basically never have to pay for the public transportation which is really awesome.
EDIT: by public transportation I mean whatever is included in the D-Ticket (no Intercity or similar types of trains).
N.b.: mk89 is technically not quite correct, it wasn't free (nothing in life is). It's usually bundled with the tuition/enrollment fee.
Implementation details differed per University, but for us the fee (80 or 100€, can't recall) was socialized across all students and payed together with the tuition fee; opting out was not possible (with some exceptions, like disabilities). The money went from the University administration to the AStA - the "general students council" (the executive section of the elected student self-government). The AStA then negotiated with the local public transport company/companies as well as with the Deutsche Bahn (e.g. to get access to certain inter-regional train connections - we still have cooperations with 3 or 4 nearby universities, and students somehow need to get there). Those negotiations can be a royal pita, and often the students were in a weak position.
Source: I was in the AStA (~12 people), but not involved with that task.
That was a time limited earlier ticket. "The tickets were valid for June, July, or August 2022. The offer aimed at reducing energy use amid the 2021–2022 global energy crisis." https://en.wikipedia.org/wiki/9-Euro-Ticket
It influenced the idea to come up with a permanent ticket: the "Deutschlandticket".
The Deutschlandticket costs max 49 Euros (next year it will cost 58€ per month) and is valid for one month for mostly all local®ional public transport systems in the whole of Germany.
Companies often support employees by paying some of the costs. Then it typically costs 34.30 € per month.
Here in my home city already 94% of the 213000 pupils use the Deutschlandticket for 0 € per month. Every pupil has free access to all of the country's local®ional public transport system... I find that kind of mind-blowing.