The word "Collaborationism" has negative meaning, according to Wikipedia
Collaborationism is cooperation with the enemy against one's country
Wikipedia also defines "collaboration" in the following manner:
Collaboration is the process of two or more people or organizations
working together to realize or achieve something successfully.
Wich doesn't sound that negative to me.
So, the question is:
Does word "collaborator" derives/associates with collaborationism or with collaboration in modern English?
I'd say in Russian it is certainly negative and is associated with "collaborationism".
Following the request in the comments I'm providing the context.
The word is used as name for subscription type on a specialized website (Trial User/Paying User/Collaborator). The website just provides economic feeds to its subscribers, so no politics here. However, the website attracts customers from all over the world.
I would replace Collaborator with Partner, just need to justify it for other members of the website administration (none of us is native English speaker).