Nothing would happen.
First of all was it certified when it was sold? If yes then no problem. Your covered
second… what happens to the millions of people using non type certified radios from the beginning? How many licensed GMRS users have 1,2,5,10 or more radios that they use each and every day and are not and never have been certified? Nothing. .this could be a cheap uv-5r or a Motorola xts5000. Or any thing in between. I’d venture to say that there are more non type certified radios on gmrs then certified
When this becomes a problem is when a user is being a complete jerk and interrupting other users. Even then it takes weeks months years or maybe never before the fcc does anything about it. And if they ever do, a non type certified radio may be an add on charge.