I personally don't mind self-upvoting
Hmmm, I'm personally unsure about this. I do sometimes self-vote my comment to the top when I see there's 60 more people and I really really have something to say to an author that I know doesn't read every single comment on their thread.
But I've seen some who arrive 8 hours later and just post a few marketing quotes and boop, attention boost.
This is the reason I said I don't mind. Almost anything can be used for good or bad. Bitcoin/Monero does fund assassinations and other crimes. But they can also be used as tools to empower people. It's about the way you use them.