I believe there are still a few services that will upvote your dust but I have only used dustsweeper. There are limits as they only have so much HP available and you pay for it. I don't really use it much though as I tend to forget to top it off most of the time.
Posted Using LeoFinance Beta
Yep, I used it in the past too. Didn't know it's still operational.
Posted Using LeoFinance Beta
It's still operational but I haven't really bothered with it too much. I do want to get my HP higher so I don't have to worry about the dust and I think the lower price of Hive is helping in that regards.
Posted Using LeoFinance Beta
What I didn't like was that I needed to fund it all the time (or block larger amounts for that purpose), but otherwise, it's useful when other people upvote your comments with dust (but not too low) votes.