I got to wondering, what sports wouldn't suffer as much without spectators ? Perhaps race car driving, where the drivers are hermetically cut off from the crowd by their engines , or cross country skiing, or marathon running where the athletes are battling their own internal endurance limits, etc but even then the celebratory feels after victories in those sports would be strange, I would think. After all, those sports also have their rabid fans. Would a great Birdie or Eagle in golf be the same without a crowd roaring it's approval?
OF course there are far more pressing issues in the world today, but TBH, while technically possible, hosting major sporting events without spectators dilutes the atmosphere to the point where it's negligible as sport. No adrenaline rush from the crowd for or against you, no roar from fans , no electricity in the air, nothing, nada, zilch. It's a pale copy carbon of what sports is, the heady mix of tension, pressure and expectations of both athletes and their fans.