I'm not sure if you're joking, but in case you're not:
Brave is not a search engine. Brave is a browser. You use browsers to interact with things like search engines.
The top three search engines that I can think of right now are Google, Bing, and Duck Duck Go.
RCS should be the default. SMS is the protocol designed for old non smart cellphones.
The exact problem is that Apple DOES default to SMS outside of imessage