Unless something has changed it's currently down. Think they had some stability issues with part of the system and will be back on it when they wake up.
Now I can see just 3 races of the same Tatuus series. I hope they still need to fully update it because honestly with all the GT cars we have, it would be quite ridiculous to launch the system with this series... Waiting....
I mean it doesn't have to be always at Spa but you know with all the God tier content we have with GTE and GT3 and yeah some great tracks as well, Tatuus at Portland is for sure underwhelming. But I am sure they are just testing around...
If they want to quality control and load test the competition servers attracting the most amount of drivers/users, free content makes the most sense. Especially with the fragmented packaging system.
I don't think that a lot of people will feel attracted by a mediocre car that nobody knows about in an almost unknown track with 3 races per day... I would say that there's more than this, otherwise I feel like the system won't start well.
All the cars and tracks for this initial test are non DLC to maximize the number of users who can participate. I did like the feature where I was missing a track and the comp system downloaded it quickly prior to any connection attempt. I'm sure as they progress with testing, they will try to stress their systems by using the big laser tracks. Patience young Padewan.