They probably have thousands of devrel/app engineer type example/demo/test repos alone - it doesn't say they're active.
2M tickets - in my 4.5y at present company we've probably averaged about 10 engineers and totalled 4.5k tickets. Cloudflare has been around longer, has many more engineers, might use it for HR, IT, etc. too, might have processes like every ticket on close opens a new one for the reporter to test, etc. It sounds the right sort of order of magnitude to me.
2M tickets - in my 4.5y at present company we've probably averaged about 10 engineers and totalled 4.5k tickets. Cloudflare has been around longer, has many more engineers, might use it for HR, IT, etc. too, might have processes like every ticket on close opens a new one for the reporter to test, etc. It sounds the right sort of order of magnitude to me.