Just installed Orion RC and was surprised to see ads. Example:
This also occurs on a clean profile and there are no extensions installed.
Also, there are glitches with loading images sometimes that I can't reliably recreate but it happened to appear there. If I can reproduce I will file a new bug.
Version 0.99.123.3.5-rc (WebKit 622.214.171.124)
MacBook Air (macOS Ventura 13.4 beta build 22F5027f)