As a TikTok Shop affiliate I first post my product videos to TikTok, then I use repurpose.io to automatically cross post that same shop video to FB, Instagram, YouTube & Pinterest with an automatic comment pointing to the product for sale. Linktree (free) now offers affiliate links, I personally use Amazon & Walmart for product links on Linktree for YouTube, Instagram, Facebook & Pinterest. In my experience people choose a platform they shop on and stick with it, TikTok Shop, Amazon, Walmart all have their own audience. Cross posting allows me to use the same product videos across all platforms and make commissions in multiple ways.