How does Epic find that
Not a good thing, you will probably be banned too.
This can be found out by various algorithms, e.g. Also via your IP address, which changes. Leave it, it is not allowed.
And how else
They can do that, don't worry. And as soon as they have any proof that it was not always his account, you will be banned. It would be a shame about the money, so leave it.
And I didn't do it
Only Epic knows that, otherwise it would be easier to get around. Better leave it, you can no longer create an account there if you get caught. If you try anyway, you may get an ad.
This is also not advisable.