Shadowban

A platform silently restricting your account's visibility without telling you, often based on signals including username pattern.

A shadowban is when a platform reduces the visibility of your account without notifying you. Posts may not appear in search results, the for-you feed, or hashtag pages, and replies may be auto-collapsed. Bot-like username patterns — long random digit suffixes, generic word plus number — are one of the signals automated systems use to flag accounts as low-quality.