Many sites ask you to "log in" with your existing Fansly or social media credentials to "verify" you. This is a common tactic to steal your account.

Fansly allows creators to set "Preview" images or clips. This means you can often watch the first few seconds of a video in high definition before deciding if you want to unlock the full version. Why Quality Matters: The Benefit of Official Access

Fansly’s content is served from secure, encrypted servers. There is no "patch" that can trick the server into sending high-definition paid video to a non-paying user. How to View Fansly Content for Free (Legally)

"Patched" versions, even if they worked, often scrape low-quality thumbnails. By using the official site: