Without more specific information, it's challenging to provide a detailed story. However, here are a few possibilities:

: Using modified clients or private servers puts your official osu! account at risk. Official staff have historically stated that playing on private servers can lead to the permanent rejection of future appeals on the main server.

A partially broken Tillerino-like API for difficulty and performance requests. Important Risks and Considerations Account Safety

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Kinue72/hqOsu-neko: osu! relax bot/timewarp and ... - GitHub

McOsu is a legal, standalone practice tool that allows you to enable Relax, Auto-pilot, and even slow down time (Timewarp) for training only . It does not connect to the official osu! servers or submit scores. It is the perfect sandbox.