[nyrikki]

It actually is :)

Under General Relativity what is commonly called gravity is a fictitious force or pseudo force and is purely an artifact of being in a non-inertial frame of reference.

While a very useful in most use cases, and accurate for most needs even Newton was bothered that under his model gravity acts Instanously. This superluminal communication makes the math work but is a spherical cow :)

As a direct comparison under Newtonian mechanics, the centrifugal force is a "inertial" or "fictitious" or "pseudo" force. Due to Einstein's equivalence principle, and under General Relativity gravity is also a "inertial" or "fictitious" or "pseudo" force.

To quote John Wheeler. "Mass tells space-time how to curve, and space-time tells mass how to move."

[msla]

I think we should dump the "fictitious force" and "pseduo force" nonsense and say what we mean: "frame-dependent force", as in this force depends on the observer being in a specific, non-inertial frame of reference. These forces are real, and observable, and their existence distinguishes inertial from non-inertial frames, which is a useful thing to do.