what the hell happened here...

I mean he wasn't hurting anyone with it

don't get it, i've seen youtube of a family that finds these tanks and restores them into working order, why he fined?
edit, ok, found it, was illegal weapons possession, took 20 soldiers 9 hours to remove all the weapoons, so yeah, there was a lot. but if he had a "collector's licence" it would have been legal. story here https://www.businessinsider.in/defense/news/84-year-old-man-fined-293000-for-possessing-a-german-world-war-ii-tank-that-he-kept-in-his-basement/articleshow/85125576.cms