Downloaders often retrieve the low-quality "SEO preview" version of the document. You will get pages with giant "PAID - SUBSCRIBE TO VIEW" watermarks diagonally across the text, making it unreadable. You wasted 20 minutes to get a file you cannot use.

: They might steal your login credentials for academic portals.

If you have typed these words into a search engine, you are likely tired of upload limits, subscription paywalls, or the hassle of uploading your own notes just to see someone else's.

: Some platforms offer free access when you invite classmates to join the service. Free Alternatives for Academic Resources

: Specific pages on the site are dedicated to downloading individual PDF notes and readings once access is granted [9, 24].