https://mangrove.reviews/ exists but has almost no users.
As far as I know, there's currently only the main instance, but the software is open source and they provide regular database dumps.
yep.com is remarkably similar to fairsearch.com, another search engine built by ahrefs which advertises a revenue share. In fact, “Read the story behind Fairsearch” and “Story behind Yep" on their respective home pages both link to the same blog post. Also, both websites have identical 'bot' pages (https://fairsearch.com/fairbot and https://yep.com/yepbot).
