Why do people insist on using != instead of ≠
Discussion
It’s at least better than `<>`
Similar to ~ instead of ≈, I assume they don’t know how to get to those symbols or don’t have easy access to them.

Because python? 😉
Depends on how you learned it initially. It’s similar to the proportionality sign in physics: ~ (east european/soviet school) and ∝ (west european/american school).
Programming probably