At least there should be CL and UEFA league games without the crowd.
The problem is many players got infected by the Covid. It harms the clubs who lose a lot of players, especially losing their key players because they must be quarantined. It is surely not as simple as we think, Covid transmission is just starting and looks to increase quickly. The best option is absolutely to stop CL, UEFA, and also local league competitions. Even with no crowd, cannot solve the problem because the real problem comes from many aspects.
I understand your point but if we consider everywhere covid can spread from person to person, football and other sports are not in the top of that list. I wish we could come up with a better solution than stopping CL, UEFA and other leagues and tournaments.
I also think it is obvious that there is a vaccination problem everywhere, including athletes. I acknowledge the freedom aspect but just get the damn vaccine and be done with it:
https://www.si.com/soccer/liverpool/news/premier-league-has-most-unvaccinated-players-in-europes-top-leagueshttps://www.theguardian.com/football/2021/dec/18/covid-chaos-leads-jurgen-klopp-demand-action-anti-vaxx-players-liverpool