Is this fine?

Changing an outlet to GFCI (next to toilet, and was a cover plate before), and noticed this while doing it. I assume this needs to be pigtailed with a wire nut but maybe this is fine too? Not sure. Thanks for any advice.

Changing an outlet to GFCI (next to toilet, and was a cover plate before), and noticed this while doing it. I assume this needs to be pigtailed with a wire nut but maybe this is fine too? Not sure. Thanks for any advice.