Legal question about MetaHuman content

Hi there,
I’ve read the FAQ about MetaHuman, the final content must be rendered and used in UE4. But I’m getting a little lost in this situation. Could user use the UE4 rendered image/video in their works?
1 - One commercial Ads is made in UE4 with character from MetaHuman, is there any royalty fee to apply?
2 - In an image I used metaHuman characters as crowd in my background, which I rendered them from UE4, is it legal to use in that term?
Thanks for the answers.