You're correct that macOS does not have built-in support for RAR files out of the box. However, this doesn't mean that Mac users cannot handle RAR files. There are several third-party tools or Command line available for macOS that provide the ability to extract RAR archives.
You can try to open RAR file on mac using command Line (using Homebrew):
If you're comfortable with the command line and have Homebrew installed, you can use it to install the unar utility, which can extract RAR files on Mac.
Step 1. If you haven't installed Homebrew yet, you can install it by following instructions on their official site.
Step 2. Once Homebrew is set up, enter the following command to install the unar utility: brew install unar
Step 3. To extract a RAR file, navigate to its location using the cd command in Terminal, then type unar [filename].rar, replacing [filename] with the actual name of your RAR file.

Cons:
- For beginners, the command line can be intimidating and has a steeper learning curve than GUIs.
- No Visual Feedback: Unlike GUIs, the command line doesn't provide visual feedback, which can make some tasks (like viewing images or designing graphics) unsuitable for the terminal.
Or try third-party tool like FossZIP or Keka to open rar file on macOS
I personally having used multiple archive utilities over the years, FossZIP stands out as a blend of simplicity, power, and aesthetics on macOS.
One of my favorite features is the drag-and-drop functionality. I simply drag files onto the FossZIP icon, and the software automatically decides whether to compress or decompress based on the file type. It's a seamless experience that removes the hassle of navigating through multiple menus or options.


For me personally, FossZIP's user interface, although clean and modern, sometimes feels too minimalistic for my taste. There were instances where I wished for more granular control or more visible options instead of diving into secondary menus.
Source: https://www.sysgeeker.com/blog/how-to-open-rar-files-on-mac.html