Earlier quoted context omitted.
I feel that spinning this as a several-year grace period is a bit disingenuous. I'm a huge Stripe fan, but this is leaving a bad taste in my mouth. Here's the exact notification that went out on April 6, 2018 in the dashboard: "As a user of Stripe Subscriptions, you will get all the functionality of Stripe Billing's starter plan with no change in price. You can continue using it free of charge on your existing Stripe…
You're right. It would have been a lot better if we'd made explicit that we weren't intending to make a permanent commitment. This is good feedback for the next time we do something like this. (Our actual thinking was that we'd iterate on the product for a few years until we were confident it was good and worth paying for -- with both large and small companies using and paying for it -- and then revisit.)
I should have known something was up when Stripe sent out the email survey two days ago about subscription pricing. Very strange that you only sat on those results for a day before pulling the trigger on this. Interestingly, some of the survey answers included concepts of a free tier.
To me, the percentage makes little sense. You could be running 1,000,000 $10/mo subs, or 1,000 $1,000/mo subs and the cost is the same. This pricing model hits high value subscription companies significantly harder, even though Stripe's costs are lower.