Yes and no.
Tesla has a huge head start with the supercharger network, although it will take both hardware and software upgrades to make it work with other non-Tesla vehicles. They will continue to expand/retrofit, and because they are already there they will be a big piece of the charging revenue stream for years/decades to come. Ford and GM have announced they aren't going to build their own network, and Tesla will get an increase over the next 5ish years (how big remains to be seen - Tesla produced 400k+ vehicles this last quarter, I don't think Ford and GM combined have produced 400K EVs total in their history).
However, the NACS (North American Charging Standard) that Tesla uses, and which Ford, GM, Rivian, etc. have announced they will be using beginning in 2024 - 2025 is an open standard that is royalty free, so anyone can (and will) be able to use it. Electrify America and ChargePoint have already announced the will begin building NACS chargers. Rivian has their own network they are building out (it is aimed more at places like National Parks and such) which they have announced will be switching over. While Ford and GM have said they're happy to let other people do the buildout, tesla won't be getting money from the other networks that are built out.
I think it's a savvy business move, but it's not like Elon just set up Tesla for a perpetual revenue stream from all charging in North America.