How many times did you get your "declared champion" in URF banned by your teammates
How many times did you get your "declared champion" in URF banned by your teammates 
How many times did you get your "declared champion" in URF banned by your teammates 
Never. The champions I play In URF are not popular or beyond broken to ever be considered banned. I'm talking about
and
. Where was the last time you saw those 2 banned?
I guess you are unlucky?
Never, actually. The one time they banned the champ I wanted I had forgotten to actually declare the champion.
One time - some dude was hella mad because I banned Fizz and took “revenge“ by doing the same for my champion. He didn't declare Fizz at all and didn't write a single thing in the chat regarding this issue - seems like I should read minds to know what he plans to play.
My declared pick banned by my teammates? Never, actually.

I gave it away once though, because that person asked really nicely.
Just once. Someone in my premade was being themselves.
Well everytime someone tries to play
I ban him but I ban him in general so idk if that counts.
You declare? with strangers? never that!
None. I never declare and never ban. Never a problem for me.
4 times in ~ 40 games. no joke
None. For some reason no one thinks to ban Leona when she is arguably the most fustrating champion in urf to play against. Especially If the Leona went undying grasp and full HP build.
I have seen teammates ban eachothers champs not because they don't want to face it. But because they are trying to force their team to play specific op unfun champs.
Accidentally banned someone's Fizz because I just auto-ban him when I lock in URF. I dodged the game after apologizing.