Assuming that the error IS that WebGL 2.0 is unavailable, make sure you have Hardware Accelleration enabled.
Steps: >> Go to brave://settings (or click the Sandwich menu, aka the button with the three bars, then click on Settings.)
Then, scroll down on the CONFIGURATIONS TAB (the tab to the left) until you see Advanced settings. (Or additional settings, not really an english user here.) Click on it.
More menus will appear, click on System, and check that “Use hardware accelleration whenever available” is enabled.
If it is enabled, try restarting the browser, or even your computer. If it dosen’t solve the problem, your computer might be too old to support WebGL 2.0, or your graphics driver dosen’t support it. (it’s my case too so we’re not alone )
Try updating/upgrading your graphics card.