I’ve been looking around at some other threads and found this thread which tells us how to fix the “issue”.
The fix is that we have to upgrade our older iMacs (2015 or older) to newer ones and upgrade to the Ventura O/S. Well, I for one will not be doing that. Before I read the thread above, I considered buying a gaming PC which would have cost me around $1500 with a monitor, but after reading their “fix” to upgrading to Ventura O/S, meaning I am being forced to upgrade my perfectly fine machine, I’ve decided to just cancel my subscription and will be writing Blizzard off. Good luck to you all, whatever you decide, but I for one will not “herded” or forced to play their game.