In any case, the point is not that the remake shouldn't have been made. The point is that there was no reason to delist the original other than to force people to buy the (more expensive) remake.
Of course a company is free to stop selling a digital product if it wants to.
Just as I'm free to point out the shittiness of that choice.
And being common does not make it less scummy.
When the new Dead Space was released, the original was renamed to "Dead Space (2008)".
Similarly the Mass Effect titles had years appended to them when the Legendary Edition was released, even though the names were not the same.
XIII was renamed to XIII - Classic when the new one was released.
Also XIII is an example of why you'd want to buy the original even when the remake is released, because the remake is significantly worse.