I'll let the people who organize this say what is going on for reals.
The mentorship concept in dev.to is an idea being piloted. Some time ago there was an announcement about the new feature to say you want to mentor or be mentored. Then the organizers paired everyone off.
I am currently mentoring someone through that process.
I don't know what future plans are or how the program will expand.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.