There's a non-political memes comm on Lemmy.ml if you so choose. The fact is, the devs are communists, and a ton of us on Lemmy are communists due to the nature of FOSS, so that's sort of a natural sorting.
Other instances, such as Lemmy.world, are also politically biased, but towards liberalism. All instances have their own biases, you can't escape politics for good.