I downvote comments that I feel are not constructive to the conversation. This includes things like unnecessary aggression / attacking, spreading misinformation, using offensive slurs or language, and trolling. I don't downvote based on differences of opinion - in fact I upvote people who disagree with me if they've engaged in a respectful and genuine way. I also upvote comments that I think are well written and insightful. Sometimes I upvote comments that have been downvoted and I can't see a valid reason as to why.

I rarely vote anywhere. I think it's a toxic habit for many platforms and it fucks with some peoples brain.
Example:
Voice your sincere opinion that you really like blueberry ice cream. Get downvoted because someone thinks raspberry is better but just gave a downvote and no reason. Spend the rest of the day wondering why.

I'll upvote any constructive interaction, but I think a big reason why aggregators got popular was the ability for a user manifest their general disagreement with something in a way that can impact the visibility of that info. So I don't think the overall nature of upvotes/downvotes could manage to be substantially different to Reddit or any other aggregator. The user behaviour is ultimately determined by the availability of the function, rather than the nature of the community that uses the platform/function

Same as you. I upvote more to keep track of who responds to me so that I can speed-scroll and still spot my interactions. Meanwhile, I only downvote pure malice.

I upvote everything I like. I only downvote if the person is being hateful or really unconstructive.