We should probably have our posts self-upvoted by default anyway, like on reddit and lemmy.
Well, Lemmy doesn't either. It pretends to exactly so you don't (I assume that's the reasoning). It doesn't actually add an upvote in your name and so it's also not counted as upvoted by you by other platforms. I can only guess it's trying to prevent people from adding an upvote by making them think the platform already did it for them.
Just check Lemmy posts on kbin (considering voting is public). How many of them have the creator as one of the upvoters? New posts with 1 upvote on Lemmy have 0 on kbin.
Discovered this a few weeks ago while testing some federation stuff.
uphillbothways