I mean I've been covering footy and sport for the last 7 years mate and I can count on one hand the number of times there's been an incident at a ground across that. We had to cover it. I know there were incidents but they didn't seem to happen as much as they have done in recent months - on and off the pitch.
It could be for any reason, as I said in my post. It's just that given everything that's happened, coincidence can feed into conspiracy theories.
As for on the pitch, in Euro footy's big leagues there's already been Aguero, Traore (Sheriff, in the CL), Lindelof, Zielinski, the lad at Wigan (Wyke, I think), albeit in training, Fleck at Sheff Utd and then I remember covering a line about a lad in Norway's league (may have been second tier) who died for a few minutes on the pitch but was saved. That's off the top of my head - they've all happened this season.
So it's definitely worth a study into why that is happening which is most likely going on, I'm sure. If it's COVID, if it's the vaccines, if it's a mix of the two or if it's something else entirely needs to be known. When elite athletes are clutching at their chests mid-game, it's worrying. I bet we couldn't cobble together as many as five incidents from across the previous 3-4 years of heart issues for players on field.