Hey, I’m Colin, CEO of Customer.io. We’ve always had a trial w/ our self-service experience. We deprioritized it (and unfortunately made it harder to find) as we built our sales experience. We’re working to make Customer.io a great tool for you to use on day one of your company, not something that gets added at Series B.
Looks like you decided not to raise money for Tier. The bootstrapper program gives you access to Customer.io for a year for free - https://customer.io/startup-program/bootstrapped/.
I hope you give it another look!