maybe you have made automatic blocking on some IPs that you suspect are used by botnets

but unfortunately some of these IPs are the Dynamic IPs owned by the largest operator in our country.

so that anyone who uses that IPs will be automatically blocked.

I think this will block the way for that ISP customers to your site

so this is the same as blocking the ISP, because sooner or later the users will use the IP address that is included in your blacklist because the IP they use will continue to change as the Dynamic IP works.

and for botnets who may have used the ISP only need to move to another ISP.

so I think the effect will be worse for genuine users than for botnets.