Money site content

i actually have a question regarding web content. if an unplagiarized unique content is posted on a site and then after small duration if the content is deleted form the site and posted on another niche relevant site, will the content be counted as a unique one on the new site. If a user owns 2 sites with same niche, can he use same content after removing it from previous site. Also it's plagiarism only if the content appears on other sites, right?

If it's an affiliate content, could it bang sales(if enough organic traffic flows) while keeping the content alive for some duration before deleting it.

The only answer you will get is "it depends".
Did Google index your post or not

Either way, include a link to old location and on old location do a redirect to new post location, and you should be fine