You might have the self-awareness and impulse control to stop yourself from getting addicted to these apps, but the majority of the world's population does not.
These giant companies pour millions upon millions of dollars into engineering their services to be as "engaging" (read: addictive) as possible with the specific goal of making users spend more time on them.
Against that, the average person has no chance. The power balance is hugely uneven.
A responsible government which actually cares for its people has a duty to protect them from abuse like that.