RE: I had difficulties understanding HSBI

I manage it. The sporadic voting basically works like this:

When your account is first enrolled, you get a pending upvote balance of with an estimated value of $0.063. On your next post, 1/3 of that is delivered as an estimated $0.021 upvote. Minimum upvote is always based on $0.021 estimate. (Since the blockchain uses other units, it's actually calibrated differently and adjusted weekly to stick to an $0.021 estimate so there's a little fluctuation here.)

After your first vote, your account accrues additional pending balance every 2.4 hours. When your pending balance exceeds $0.063 again, you get another upvote. When you have more units, you accrue pending votes more quickly (fixed amount per unit * number of units) so you get upvotes more often. At some tipping point, your pending balance estimate begins to grow larger than $0.063 (because you are accruing more than $0.021 in between posts) and then you start receiving votes every time you post. If you keep increasing your level, your vote size will continue to grow until you reach our deliverable maximum (100% upvote across all of our main voting accounts).

This is detailed in more depth in our FAQ at https://docs.hivesbi.com/
You can see your unit levels, pending balance, enrollment history, and votes received at https://www.hivesbi.com/

Both pages have links to our active Discord where we would love to answer any further questions.