I'm so glad you posted about this, because I'm also having the same thing happening.
It's usually 6 visits per day from Council Bluffs.
I'm wondering if it's related to some app/extension, but I haven't installed any new one recently.
Another thing that crossed my mind is if the developer of the theme I'm using is from there. I use the theme Broadcast.
I am on on a different theme so may not be that.
I did download Ping last month or so but other than that nothing. Usually I get 3 visits a day, all in quick succession so can only guess it is some sort of spying software. It is a pity Shopify will not assist in the blocking of such visitors.
Surprised no one else has raised this before
This is so weird. I feel like some spyware is doing this to be able to get some information from my store or something. Creepy!
Shopify cancelled their hotline and it's hard to talk to them nowadays, which is a shame. The stock price sky-rocketing and they cut on the most basic thing we need, which is talking to them.
The forums and help center are not effective most of times. I don't know what they're thinking...
I am also having the same scenario happen. It has been about 2 weeks since daily reviews from CB Iowa have started. I am not sure what the deal with that is, but I would love it if we can keep this thread going until we find the cause.
Hopefully Shopify's customer service call line will come back after C19, but I feel like they will fall victim to the same mindset most tech companies have of not aiding the customer.