Obviously things can vary and it all depends on said brands relationship with that individual but yes this is a very common practice that brands will pay a fee for post or video or tiktok whatever it may be. Especially on accounts that have a large following and reach and the more engagement and reach that account has (in general) the higher the fee can be. This is just from my experience and I’m not saying this is what’s 100% happening here but it is very common practice in the industry.