My impression (ex Stripe with no inside knowledge) is that Visa has been raising rates. Stripe are doing their best to avoid passing it on. This is one place where it surely became egregious not to.
I’ve never seen a company as averse to squeezing users as I had when I was there. The finance guy I worked with produced analysis for the team showing ways to reduce pricing more often than ways to increase it.
Your skepticism is warranted against most businesses. From my experience as a PM at Stripe, it is unwarranted in this case.
Disclosure: ex Stripe, own stock. No inside knowledge.