the.com/leecher

means Someone who takes freely from a shared resource — files, bandwidth, goodwill — while giving little or nothing back in return.

from From 'leech,' the blood-sucking worm long used as a metaphor for anyone who drains others without contributing — the sense traces back centuries before computers existed. File-sharing and torrent communities picked up the word directly for users who download without uploading, coining 'leech' as both noun and verb for this behavior; 'leecher' is simply the agent-noun version, the one doing the leeching.