They serve the exact same role they did at the start. If we'd open stadiums now the exact same thing will happen, that happened 1 year ago.
Lockdowns will continue until we either reach herd immunity naturally or through vaccines or we have a treatment/mitigation for the disease.
Your conclusions don't match reality. States like Florida have open stadiums and are fairing the same as states like California that insist on totalitarian overreach.
With the exact same density as before ?
I won't say with confidence that a short, hard, lockdown would have solved things in the us, but such approaches did work in many other nations.
And "hundreds of thousands of Euros?" That's a pittance. There has to be more to be made (than maybe enough to buy a studio apartment in Berlin) in order to justify the shutdown of a large part of world industry.
Ok, they make money from selling masks. But do you really think no shareholders in hotel chains, airlines, airports, etc. are trying to push back against that?
Covid is hurting a ton of businesses. A lot of powerful people are behind those businesses that feel that pain.