The Australian ban, and proposed bans in other countries (generally I only looked at a couple) aren't targeting things like Nebula though, focus is on large scale user to user platforms.
I just checked out YouTube front page in a fresh browser and it's several tiers below Romantasy in my opinion. You may have a more personalized experience, but the front door of Youtube is... nauseating.
The medium matters as well, the audio, visuals, length, like a sleezy, hyper active content casino.
Anyway, I cheer for any friction added to these tech companies because they are doing so much harm, so anything to slow them down.
But I do get the concerns around IDs and privacy (I personally wouldn't provide any). I think regulatory capture concerns are real as well. My preference would be on targeting the recommendation systems, and also making the platforms liable for content they are broadcasting.