They have substantial revenue, so not taking much investment isn't surprising. I just wonder what the thought process was in deciding to sell to Google at this

They have substantial revenue, so not taking much investment isn't surprising. I just wonder what the thought process was in deciding to sell to Google at this price. This must still be a huge win for the founders. They probably still had most of the equity since they only took one round of financing, and at a point when the company was already mature.