Can I exchange Fortnite accounts?

Is it illegal for me to exchange Fortnite accounts with my friend?

At least it is not intended according to the developer.

Don't know that there's a law against it.

Should be prohibited. At least that's usually the case. But nobody will be interested.

As a rule, the transfer of account data is not permitted by the rights holder.

Should also be found in the respective terms and conditions (AGB and the like).

Illegally not, but it could possibly violate the terms of use, which in the "worst case" could lead to the blocking of both accounts.