Command AI co-founder here. What I'll add to Spenser's nice comment is that there was this strange tension when we were deciding to do this between: (1) Feeling like the only right outcome for a growing startup with runway is to keep going and try to build a massive independent company, (2) Realizing that we can probably grow faster as part of Amplitude (obv with less upside capture)
Obviously if your growth is so epic and you're a top 1% company, the choice is obvious. But there are a lot of companies that are doing well outside of that group that I don't think allow themselves to consider the acquisition route. We were like that until Amplitude reached out and we got good counsel to seriously consider their offer.
I'm going to be following very closely how Arc approaches monetization. Don't think they've talked much about this yet. Right now they are towing the line between art project and business extremely well so far, but I wonder how this will work at scale once they're through the honeymoon early adoption phase.
I'm not super familiar with chatbase (which looks awesome in its own right). Some things that I haven't seen before:
-Semantic search added
-Ability to open source docs in the widget
-Recommendation sets
-Personalized suggested question
Also we're pretty focused on embedded use cases and looks like chatbase is more generically usable (e.g. on discord, via API).
But honestly, I expect these products (including our own) to grow so much over the next few months than this answer could totally change.