I think Google bots check on random days, on random countries and on random developers.
You might survive even upto 5 years or so.
But to rule out the fear, better follow what they want.
I survived for 2 years with exit ads. Tyen some day i got warnings for my 2 apps and removed exit ads for all the apps and made appeal again. They have resumed the ads again.
Got ads suspension from admob. Admob do not allow exit ads. But still it depends on them when they will catch you. It might take even 2-3 years or 1 day for their bots to find out.