I'm pretty sure gravity works by a combination of the expansion of spacetime and the curve of spacetime.

If space is always expanding, like, if I visualize a little ball in the middle of 2D space then all the vectors (arrows that represent the constant expansion of space) point outwards equally in 360° causing it to stay in the same spot. Equal forces all around canceling one another out.

But if I put a massive object near that ball the space expansion vectors curve towards the big object, causing the vectors to be uneven and cause acceleration towards the curved spacetime.

So from the 2D space the ball would just look like it's staying still in it's own perspective because it's still in the same point of spacetime. But from the outside perspective where we can see the curved grid of spacetime the ball would be moving due to the vectors not all totally canceling one another out.

------------

In black holes space and time flip, at the point of the horizon all 'directions' point towards the center and the only way to leave is backwards in time. All those vectors of expanding space curve and point in one direction.

So, you're on earth with me. Spacetime is a little curved on the surface. more of the space expansion happening at your local level is pointing down, causing you to casually accelerate towards the center. At like 9.8m/s^(2)

Anyway, I'm pretty sure I'm right.