Are there any authoritative resources from said organizations saying you shouldn't use their servers for your persistent ping destinations?

I'm not sure that an ' authoritative resource ' is really needed. It should be generally understood at this point in the internet's life that networks will block / restrict some or all ICMP traffic as they need to. 

On Tue, Feb 8, 2022 at 12:58 PM Mike Hammett <nanog@ics-il.net> wrote:
Yes, pinging public DNS servers is bad.

Googling didn't help me find anything.

Are there any authoritative resources from said organizations saying you shouldn't use their servers for your persistent ping destinations?