When you broadcast something clones will do it to, so if want to create a clone or change a variable the clones will change it as well. so in some of my clicker games when I was using broadcast tick clones were everywhere and variables were getting way to big.

there should be a option for broadcast blocks to be able to go to clones or not.

this should go in the Suggestions forum (i think), since you're suggesting a feature to be added

I thought that, but it is a really big thing to deal with in my games (this is my new account) with heaps of clones eg https://scratch.mit.edu/projects/1103204977

I will add it to that forum as well.

I'll move this over to the suggestions section for you - that's a better fit for this kind of topic