Last week I ran into this issue after updating to Catalina 10.15.7, I uninstalled and used an older version of InD. Then CC 2021 came out and seemed to fix the problem for a few days. Now it's back to crashing on start up again. Did the same stuff I did last week, uninstalled the program and reinstalled. Turning everything off and on. Troubleshooting isn't getting me anywhere. The other newly updated CC 2021 programs are working just fine, and all of them are working on my Windows laptop including InD. Could it be Suitcase Fusion? I cleared the settings upon opening InD.
Those steps didn't help me either.
I'm now having the same problem with Illustrator.