I would estimate that 95% of people who share content here did not purchase it themselves. In trades, both parties are likely exchanging items they did not acquire through legitimate means. When you share something on the forum, it is understood that anyone who downloads it will use it however they please, including sharing or trading it with others.
Much of the content posted here has already been shared for several months on other websites or through personal connections, such as other Discord servers or friends. People obtain this content in various ways. If someone posts a request for something and another person has that item, they may be inclined to share it with them. The person sharing may not even remember where they originally obtained the asset.
Those who complain about their content being shared around are hypocritical because they are part of a community that revolves around sharing other people's assets and avatars without paying for them. Not to mention, the things they are claiming as theirs is not even theirs...