Methinks this may happen us too:
GrapheneOS (@GrapheneOS): “GrapheneOS developers/moderators are being impersonated across different platforms (Matrix, Telegram, Reddit) as part of the attacks on the project. They’re copying our display names, avatars and usernames. Make sure to confirm it’s one of our accounts and not someone malicious.” | nitter - https://nitter.net/GrapheneOS/status/1439296676129292288?s=20
Regain your privacy! Adopt /e/ the unGoogled mobile OS and online services