Lemmy isn't a platform at all. It's a piece of forum software.
The platforms are the individual instances - lemmy.world or lemmy.ml or lemm.ee or whatever. There's well over 1,000 of them total. And they range all the way from extreme left to extreme right, and from rigidly constrained to entirely open.
And since it is the case that there are well over 1,000 instances, each of them privately owned and managed by whatever standards the owners prefer, there is no mechanism by which any particular bias can be maintained at anything above the instance level. That necessarily means that any lemmy-wide bias you might see can only be organic.
You might honestly think about that, and what it says about the ideology you're trying to pretend you're not defending.
Just Right