I wonder if they are including in that the money they already invested in the Ahrefs SEO tools. It seems to me that their SEO tools were already crawling a lot of content so this may be an extension of that / a new way to monetize the data. I personally know a lot of people who pay for their SEO tools so I imagine they have a decent amount of revenue.
There is a lot of intersection between Ahrefs tools and search. We were collecting web data for Ahrefs tools for 12 years, now we repurpose these data for Yep.