That depends on location. They recently expanded into my city and only wanted a self-inspection. Literally a checkbox that says “yes, I verified these things”.

Uber at least demands a check sheet filled and signed by a mechanic from a list provided by them, and it has to be refreshed yearly.

Perhaps it has changed in general. When I first started riding with Lyft two years ago that was policy everywhere. Maybe they realized it is not something that can be accomplished at scale. Which would be unfortunate because I know several people, women in particular, who found that policy to be a differentiator in the rideshare competition.

From what I have read on driver subreddits Lyft takes far shorter time like 2 days to approve drivers as opposed to Uber which takes 2 weeks.

In my experience, driving for both about two years ago, Lyft did require an in-person visit from a "mentor" to get approved, while Uber did not. Neither required any sort of technical inspection or mechanic check.