Meta (née Facebook) hired addiction medicine specialists to work on their platform engagement. It wasn't to make teens use their platforms less.
There are no meth companies, the cigarette industry is regulated as far as we can take it, opiates and medication is regulated with punitive damages levied (once evidence passes a threshold). Gambling is highly regulated (and prediction markets will be as well, eventually)
I don’t remember off the top of my head, but I believe even reward programs will have regulations surrounding them.
Above all else: What we did with social media, lootboxes and phones, was unprecedented.
The safety people brought up the issues in the firms, and the final decision that had to be taken was to ensure shareholder returns.