There are much bigger issues.
1. Users or one might say content creators don't own their data. Not just do those platform owners make a lot of money with the content (which they have a license to, as per site ToS) but then you have third parties scraping it now for commercial products. Using the data to train models that are then sold back to some of the same social media users who produced the content for free in the first place wasn't a thing until very recently, it used to be a select few doing machine learning research in the past. The laws are lacking behind the tech development and regular internet users are being exploited because of it.
2. It absolutely is stealing in some cases, and even worse. For example when they scrape it for content which they then use to train their bots to impersonate humans. Or on Twitter, there's a very common type of bot that steals content from young attractive female social media users in China, auto-translated to English, to pose as them. If you're in finance and crypto circles they're swarming with these accounts (guess the scammers know their targets).
3. In general this is only going to get worse from here on. LLM are getting better and better. On sites like Twitter you already have no idea if you're interacting with a human or not. But these "AI" can not actually think for themselves, they can only emulate, they can copy other humans. At least so far. So for the sake of making progress and ensuring we can still have intelligent discussions and find novel ideas online, it's imperative to have a way to keep the machines out. Social media must become sybil resistant or it dies in a vicious circle of self-referencing bots ever parroting the same old talking points, or variations thereof. We urgently need human ID!