in my country it’s not illegal to download roms or games or movies, just sharing it is illegal!! and i don’t share at all, but i’ve heard that in the us they are extremely strict about that, what if someone sees i’m playing gameboy on my phone and realizes i downloaded my roms from the internet?? dangerous?? thank you
You’ll be fine as long as you don’t come to the US.
The above statement has nothing to do with whether you have game ROMs or not.