I don't understand why they had to make the change global. Why didn't they just do this for e.g. patrons paying more than $10 (or whichever amount makes sense)?

I don't understand why they had to make the change global. Why didn't they just do this for e.g. patrons paying more than $10 (or whichever amount makes sense)? I support a lot of projects but only the minimum of $1-2 per month/project and suddenly they were all $2-3 (multiplied by 10 projects is a huge tax).