I don't think the majority is protesting specifically against the campus building. But rather against Google as a tax evading company and global brand of person

I don't think the majority is protesting specifically against the campus building. But rather against Google as a tax evading company and global brand of personal data gathering. In that sense they're in the same category as your landlords. Economic crime favoring the rich. But what do I know, I'm not even in Germany. You should go to the protest and ask them.