The problem isn't X domain of business is more scummy than Y. They all are. That's kind of the problem. Tech is just egregious though in it's non-reliance on physical matter, meaning anything that can be digitally rendered is instantly a world scale fucking problem.

If it were one building in one state doing this shit, no one would care, and we'd just block or tell people don't go in the building. That doesn't work with digital products that started benign, then had the addictive qualities turned up to 11. That's malice, at scale. If every ice cream parlor, or link in the ice cream supply chain started adulterating ice cream with drugs, regulators would have dropped the hammer at the site of adulteration. Meta et Al have had no such presence forced upon them due to lack of regulation in some jurisdictions, or being left to self implement the regulation, thereby largely neutering the effort.

No. It's been established that social media use can produce addiction-like behaviors, that it uses mechanisms similar to gambling and substance addiction, and that a subset of people experience significant impairment as a result of social media consumption. It's still debated if it should be classified as a form of Substance Use Disorder, which is what the term "clinically meaningful" refers to, but the debate is more a matter of classification and semantics, not if the issue exists at all. And not what people are referring to in the context of this case and discussion.

If you're interested in the topic further, you could consider reading 'Toward the classification of social media use disorder: Clinical characterization and proposed diagnostic criteria', which should shine some more light on what people are referring to as "addiction" in this circumstance :)

If you're interested in the neuroscience, consider reading "Neurobiological risk factors for problematic social media use as a specific form of Internet addiction: A narrative review".