I still think this is mostly a positive change, but it is a bummer that the service plans keep changing.
I'm interpreting "every single month we use it" as every month you use starlink. In that case, you're incorrect. You can change plans when you hit the limit and then change back for the next month.
So instead of paying $1/GB extra every time you go above 50GB, you pay $115 extra every time you go above 100GB.
For most usage patterns, the second option is cheaper. And it sounds like your usage pattern is one of those.
(If I interpreted you wrong, and "every single month we use it" is supposed to mean the months you go over 100GB, then "every single month we use it" and "the few times we go over" mean exactly the same thing. Why word it with such different implications each time?)
You do you, I guess.
> we don't regularly go over 50Gb
I mean, you did.
And now, even if you did go over 50GB, you get 50 more GB to use at the same price. If you barely went over before, then you will likely not use up the extra 50GB, and therefore are paying less than before for the same usage.