Fortnite will not be avalaible,
But there is plenty games avalaible on steam for Linux, a lot of Indies but well made.
And BTW, they can be soft brained so its really good for kids.
There is also itch.io where you can find some ore.
But I hope they don’t play fortnite to be with friends because it will be tough for you to convince.
I love my pixel 6a, except for this point.
Fortunately, I have no bad experience on it with USB c adapter and the jack glued to it 😁👌