Every map projection has some degree of distortion because

Because its properties such as shape, size, distance or direction gets distorted

Explanation:

Map projection refers to the process by which the three-dimensional earth is represented in a two-dimensional model, such as in a piece of paper. This is widely used in order to understand the entire earth's surface and the features present in it.

There are two major properties of map projection namely shape and size, that gets distorted while projecting. In addition to that, distance and direction are the minor properties that also gets distorted.

While projecting, the shape of the continents and oceans are not exactly equivalent, and the size also decreases or increases, due to which these distortions occurs. The distance and direction are usually not affected much, but sometimes they are distorted. So, in controlling one pf these properties, the other gets distorted.

Thus, every map projection has some amount of distortion.