When I joined Blurt a year ago, I didn't like the self votes either. I addressed this at the time just as you did. There were also posts on the topic and it was discussed.
My conclusion in the end:
yes, if you don't overdo it, it's perfectly ok.

That was my post on the subject at the time, but it would be discussed elsewhere....:
https://blurt.blog/blurtgerman/@elkezaksek/upvotes