I sold my bmw to Vroom a while back and was pretty shocked by how little inspection they did before they offered me a check for the car. No mechanical inspection, no putting it on a lift, just a walkaround and a 5-minute test drive. In comparison when I requested a quote from Beepi they were very thorough and checked every single part of the car, giving me a complete report as well.
Judging by my experience selling the car I wouldn't trust buying a car from them without a full inspection done by a mechanic of your choosing. Too bad beepi was acquired and shut down in CA but they seemed like a much better-run company.