If you’re asking ‘is that a paid service’ then no, it’s essentially russian Google and free to access

If you’re asking ‘is it privacy conscious’ then no, it steals as much data as others, but for Russia instead

If you’re asking ‘is it open source’ then no, it is closed source, and using a client like searXNG to interface with it is too much hard work since the way Yandex does searches (the thing that makes it different from Google) relies on the users and not search optimisation, so Yandex is extreme on detecting if it is an actual browser or not