This appears to be a slippery slope argument: if they ban specific algorithmic social media platforms that have a verified extremely negative effect on children

This appears to be a slippery slope argument: if they ban specific algorithmic social media platforms that have a verified extremely negative effect on children, soon they'll ban all communications. It could happen that they ban all communications, but if you think so, it needs its own argument; it can't hang off the social media ban. Otherwise it is like saying that if they ban children from drinking beer, soon they'll ban them from drinking liquids.