Can someone explain why Ekko has been getting banned 100% lately?

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Because ill just build a ga and then ill have 3 lives. all of which are incredibly hard to kill. And with a nice stun team fights can be super easy

this means so little if you have no damage to do anything with. Even when you hit the towers your damage is minimal and you have no attack speed.

His lane push is shit His teamfight stun is strong if people are clusterfucking around with no tenacity but then alot of people learn not to do this in the first year of playing.

The only thing really wrong with tank ekko is that he is sometimes hard to see after blinking somewhere

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It is because when Riot tried to balance him, they tried to make it in a way where champs like these won't fall off if they don't fulfill one specific role (assassins referring to feast or famine). Instead, they gave champs like Ekko an opportunity to adapt to the meta. They increased base damage thinking it would help champs that are very strong at dueling but weaker against champs who push wave hard during laning. This causes champs like Ekko and Zed and the like to fall behind considerably. At the end of the day this is the best way to balance assassin's in comparison to the unintended side effect of increasing base damage which was Tank Ekko.

No one is saying he is unbeatable. Technically in higher and more competitive MMR, Kindred was a much bigger threat. There are plenty of champs in higher ELO that generate better win %; not saying that concludes how balanced they are. Ekko is not balanced. It takes very little skill to play and his entire kit is basically low risk high reward. There aren't many champs that are considered low risk high reward but all of them are considered high tier (ie. Lucian. lol at people who are all of a sudden Lucian mains). Yet despite being extremely easy to play and yielding high reward, you can be behind (mind you not severely) and do more than most of your lane opponent as Ekko. And on top of his already high mobility and safe kit AND high base damage, he is now building tanky which also boost his dueling potential significantly in team fights where it is BETTER than the intended origin of Ekko's kit which was AP. I mean AP Ekko's don't generally have a lot of success in comparison to the Tank build. Sometimes when things go a certain way you didn't expect, it's not always bad... but in this case you can't deem it good either. They had a specific idea they intended Ekko to have and it did NOT go that way, it actually made him much stronger.

You can argue Riot ninja'd this because champs like Ekko/Zed are "cool" and flashy thus very marketable. They want people to use champs like this and make cool looking plays because those sell the most. This is all strictly a business move. Riot has no intention of balancing the game. Then you'd see some Janna/Lee nerfs as well as Lucian nerfs and buffing many ADC's so there is at least SOME gap lessened between Jhin/Lucian and the rest of the ADC's at like below 10% pick rate. You'd see nerfs on Thresh (I mean I love Thresh but c'mon... he's extremely strong).

you explained why it can be argued that ekko is toxic to this game

you did not explain why he is overpowered very well.