Copy-pasted my comment here, but similar to how we no longer use "retarded" to be sensitive to the disabled, people have been rethinking words like "crazy", "insane", or "sanity" to be sensitive towards those with mental illness. For people with mental illness those words may be loaded with negative meaning and there are often more neutral or descriptive terms that can be used instead.
Update: Not sure why I got downvoted for stating the rationale for why people are making this change. Objectively I haven't even stated my opinion on the change, just the rationale I've seen for it. If you want a source here's one from NPR around this language: https://www.npr.org/2019/07/08/739643765/why-people-are-argu...