The 8 most banned champions all have negative win rates
This is confirmed by multiple sources.
https://www.leagueofgraphs.com/champions/stats/by-banrate
https://champion.gg/statistics/#?sortBy=general.banRate&order=descend

Akali, the most banned champion by a wide margin, sits at a pathetic 45% win rate. This is a clear indication that people are banning these champions because of their kits, and not because they're OP. And half of these champions are very recent, with Akali, Irelia, Pyke, and Aatrox all making the list.
I mean, a 63% ban rate with a 45% win rate. Riot, this is a massive indictment of your recent champion designs and game balance. Champion bans, which people used to use to ban lane counters or champions they personally didn't like, are now being used en-masse to opt out of your recent work.
And this isn't just the boards complaining. Just look at League of Graphs, her ban rate is #1 across all regions(excepti ID, VN, and TR) in gold and up. Hell, her ban rate tends to rise as you go up the ranks, despite her sucking.
EVERYONE hates this champion, from Bronze V(rip) to Diamond I, from Korea to NA to EU, NOBODY likes this champion.
Riot, it's time to swallow your pride, and admit that you're taking this game in the wrong direction.