When an "influencer" provides a link to a product (aff link),they generate money when people not only buy the product linked, but buy anything else from that website - for up to 30/60/90 days depending on the influencer/shop deal (unless you clear your cached cookies).
A lot of influencers like to aff link items from amazon (and other regularly used platforms) for this very purpose, so they make money off anything you buy for a period of time. Hence lots of influencers going overboard on aff linking items around Christmas, black friday etc.
Influencers also like to buy hauls of clothing from websites, do videos and aff links and then send the lot back (!) or link gifts and make endless money off them.
"loads of people are asking about this t shirt so here is the link" 🤑