If you already have Hive SBI units, then you will have free upvotes forever. The actual upvote is based on your HSBI units, it resets after upvoting your most recent post. If unused it will accumulate until a new post is published by you
I see because I receive some SBI unit from poems I wrote in blockhainpoets (hope I spell the group name correctly) maybe the unit is still small that's why I haven't seen the upvote for quite awhile.
Thank you for simplify the explanation I think I got it now
I checked your info, looks like you've been sponsored already with 7 HSBI.
https://www.hivesbi.com/userinfo/?user=caelum1infernum
Check the upvotes on your posts if you see: steembasicincome, sbi1, sbi2, ..., and so on. Depending on their VP and RC their curating accounts will do shifting.
I see thank you for checking for me appreciate it. You're correct I did have an upvote from them in an old post