I think this misses the point: regardless of Resend's exit strategy, they are innovating now, unlike the competition (allegedly), and that's the value proposition.
...Until they have an exit, and they can only have this because they took funding, which is my point.
I remember MailChimp not taking any funding for over 20 years and being completely bootstrapped, innovating and useful until they eventually got acquired and not shutdown.
Also the same for Postmark.
Both are profitable and were bootstrapped for years.
Sometimes it all ends the same way, the question is how long for Resend. Since they've taken funding as it is highly likely they are heading for an exit in under 10 years.
