[Foofoobar12345]

This will very likely be an app inside "Toybox" - where there are other fun/goofy/pointless apps like replacing the car's horn with goat bleating / fart noises, light show, romance mode, changing the car's path to rainbow etc.

If that's the case, this may actually be fun. The only notification a user may get would be in release notes when updates happens. It may not be an ad in the way most users understand what an ad is, as in, its not going to play when you turn on the car. That said, Tesla is probably getting paid for this.