First, what country are you in? Charging is different between the US and other countries. In the US Tesla's and Tesla Super Chargers share the NACS plug (scroll back a few posts to look at the plugs). When you have a Tesla or a Ford/Rivian you can just plug into these and get billed though your vehicle app (charges the card on file).
Tesla's have one rate, while 3rd party (Ford/Rivian) have a higher (but still cheaper than a lot of other L3 non-Tesla chargers). Ford/Rivian need to use an adapter that goes from US CCS1 to NACS (provided by Ford/Rivian, or 3rd party).
If you have a Tesla and want to use non-Tesla charges, if there are fees, you will need their app to facilitate charging. My local grocery store (Volta has L2 charging J1772 to NACS adapter is needed) has free charging for the first 2 hours. There are tons of paid Non-Tesla L2 chargers around me, but you need their app. If you want to use a non-Tesla L3 charger, you will need to use a NACS to CCS1 adapter, and facilitate payment with the app of the charger.
I think things are different in Europe, as I believe their chargers are mandated to have "at pump" payment capabilities. So, you can pay directly on the 3rd party chargers without needing to download an app. They also have the benefit to Tesla, Tesla chargers, other vehicles and other chargers all using CCS2. So, it is just payment, which since they have a "pay at pump" mandate, it is seamless.
Since there are several companies, and some require money sitting in an account (not exact payment), it really is not ideal to use 3rd party chargers in the US, unless you stick to a particular brand. I have money sitting in an account for Flo chargers that I never use...
Also, if you happen to be in a remote place with no cell phone service, you are out of luck on these 3rd party chargers... Especially if you need to download an app and setup payment prior to charging.
In the US, the Tesla public charging experience is just better. Even if you have a Ford/Rivian that can use Tesla chargers, they are still limited to compatible chargers. It is nice though that they get direct payment when they do use a compatible charger.
EDIT: The lack of standard really screwed us here in the US. If you need to use public chargers, the best experience is Tesla, not only because of not needing all these adapters, but also because Tesla has the best uptime vs others. So many other companies do a terrible job of maintaining their chargers.
But for me, I charge at home 99% of the time. In the last 1.5 years, I have used chargers a total of 4 times away from home.