I don’t really understand what you’re getting at.
People often downvote without posting a comment as explanation.
I’ve noticed lemmy users do this more than reddit.
The explanation is simply that they don’t like the vibe of what you’re saying but don’t know how to respond.
I think you might be talking about vote fuzzing. This denies bots the ability to check whether they’re banned.
Votes shown are inaccurate by a few votes . You can’t check whether your vote was recorded by refreshing the page.