No, it is more that any one company that installs unwanted stuff on my computer is probably not some thing I trust as a privacy-focused software. Besides that VPN services have extremely broad permissions to look at or modify traffic, so it might be a attack target if not properly secured (which it might not be if it was "accidentally" installed). It also might signal that brave is looking to become a much broader company besides their current browser-crypto-ads thing, which is worrying for privacy.
There are many reasons for an accidentally or not-really-accidentally vpn service being installed behind the users back is alarming.