They don’t show up there for obvious reasons. Also sites disappear frequently, or move to new domains. You have to use alternative ways, bookmark megathreads and other collections where some other people frequently update the links, something for start:

• On lemmy: !piracy@lemmy.dbzer0.com read the sidebar
• https://wiki.dbzer0.com/piracy/megathread/
• On github: https://github.com/Shakil-Shahadat/awesome-piracy
• Some good links are here as well: https://fmhy.net/