Even before the recent inflation in the general economy, Tesla had dramatically increased electricity rates at Superchargers.
First, most locations that had been doing per minute billing were converted to per kWh billing. The per minute rates were VERY CHEAP especially if you disconnected at something like 60%. My first Supercharger trips in 2018 were cheaper per kWh than charging at home.
Lots of other threads about the higher Supercharger charging costs here on TMC, but the general way to think about it it that you are buying the convenience of super-fast charging, not the electricity. Similar to buying a candy bar for $2 at a gas station instead of $1 at a grocery store or $5 for a soft drink at a movie theater.
It definitely hurts the people that don’t have charging at home or work and only charge using the Supercharger network, but for most, where you charge at home, except for a few road trips each year, it doesn’t change the economics much in the grand scheme of things.