Hello

I can see how on a forum that the content gets quite mixed.

is there some way to make the initial post the determiner? So that if someone replies to an original post it is understood that the poster is allowing his content to be collected in the original poster's data? Or does that cross some lines?

A poster allows the use of her/his content within the forum implicit with sending the entrys content. I as a poster would not expect to allow the use of my own content as part of the content of another user (in contrast to the use inside the forum itself). IMHO this is not a good idea.

Beside from that the question remains, if a users posting is part of her/his personal data (in the meaning of the GDPR).

Tschö, Auge