Actually that wasn't exactly the fault of our retarted government , nor were there any law changes.
Government wanted a better age verification for steam, u know better than the are u over 18 ? ''yes'', cause
protection of minors...Steam/Valves answer was no and geo blocked all adult only games
Currently the case is in the EU-court, millions in fines, probably mass action lawsuit against Valve etc.
Geo-blockling like Steam does is not legal as per EU law, they are not allowed to geo block regional inside the EU economic area...well we will see what comes out of it.
Well there are ways to bypass the geoblocking, but there is/can be a risk that ur account get's dusted.
As a dev it shouldn't be a problem to publish the game, it will simply not be accessible in germany thats all.