I'm paying an email-first startup £2k a month right now. In fact, it's not just email-first - it's still email-only. They don't even have a website.
They are actually moving to email-first-and-now-a-bit-more tomorrow - from tomorrow onwards, there won't even be any email, as the data they're providing will go straight into another system through an API. From email-first to not-even-email.