Free users are capped at significantly lower speeds (often around 50 KB/s), while Premium users enjoy maximum available bandwidth.
These are the most common "bypasses." These services maintain their own premium accounts and act as a middleman. You give them the Upstore link, and they generate a direct, high-speed link from their server to you. However, they are often ad-heavy and frequently go offline as Upstore patches their access. Debrid Services: upstore premium bypass