Never say never, but I think Tesla are beyond the point of no return in putting 100% of GigaBerlin into operation.
Aside from the fact that they have been given huge tax incentives, subsidies and grants from Germany and the EU, as well as obvious support from the German government (despite the fact that it’s an election year), do you really think Tesla is going to drop their project to stick it to German ICE, in their own backyard?
There is another reason Tesla is located in Germany, and not a “cheaper, less complicated” (hahahaha - the “east” is neither cheap nor less complicated, unless you’re corrupt): Talent.
Tesla needs to attract the highest talent to work at Giga, and being located in Germany ensures you have access to the huge talent pool in German automotive, as well as attracting Talent from elsewhere.