This is not limited to Teslas.
I purchased a 2018 VW Tiguan for my daughter end of 2020. She had it for slightly more than a year, decided she wanted an electric car, so I sold it. I received $2,000 more then I paid over a year ago. I got her a Kia Niro, which she loves.
My neighbor is selling his 3 year old Porsche Boxster, because the prices he's getting quoted are ridiculous.
There is a major shortage of new cars due to chip shortage, which has created a much higher demand on used cars.