Chrysler, jeep, dodge, ram, fiat all have a SGW- a secure gateway that doesnt let any un-authorised diagnostic tool to connect to the car and delete faults or do any repairs, you can still see faults but cant do anything more. If you want to do more you have to buy theyr tool for 15000$ and 1000$ a year, or to bypass the SGW and do the repair ilegaly.
Renault, nissan, infiniti all have a SGW that cant be bypassed normaly so you have to pay about 10€ for a 24h connection for one VIN code. There is no free way to connect to these cars.
Mercedes just introduced a new SGW that i dont know anything much but you can pay to bypass it. The price i got was for 800€ for 50 connections.
VW group is working on a new platfrom with Rivian that is sayed to be 100% not bypassible in any means. Onley a dealer would be able to do anything.
BMW is letting connect and do anything but its made harder by locking every part to a VIN so that you cant use used parts. Rumor is that next generation bmw will not be able to use used parts. Some cars dont let you do it now but there are ways to make it work.