I know that Black Clover isn't a good series by any decent standard of storytelling. It's just a bog standard shonen manga, forgettable in any other situation. But out of all the series jump has attempted to push so far, such as Toriko, MHA, World Trigger, OP or what have you, it has the biggest disconnect between its overall quality and the amount of attention it receives from Jump's editorial team. Which is starting to make me wonder if Tabata is in someway connected to the higher ups working for the magazine. Thus generating backlash from people who follow stuff like the TOC and adding even more criticism than it would normally receive.
As for why there isn't a popularity poll, I'm just speculating here but since series usually receive a popularity poll around the 50+ mark. Jump releasing a poll would give a more accurate indication of just how many people are following the series as opposed to its place in the TOC. Even lesser known series like Samon-kun managed to get a poll by chapter 59, and Black Clover having 90+ chapters add to my suspicion that Jump has something to hide about BC's numbers.