A leecher (in this context) is not a P2P client. It is a script, proxy, or web application that acts as a middleman. Here is how a classic Ubiqfile leecher worked:
: This implies modifications to software, potentially to bypass security measures, enhance functionality, or circumvent restrictions. A patched version of a leecher for Ubiqfile could be aimed at bypassing download limits, account requirements, or other restrictions. ubiqfile leecher patched
: Leechers exploited API vulnerabilities or session-sharing bugs to trick Ubiqfile's servers into thinking a free user was a premium subscriber. A leecher (in this context) is not a P2P client