Which shouldn't be hard when they're objectively maximizing engagement at your expense. The hard part is figuring out how to overcome the network effect.
This needs more proof - specifically, would people agree it's at their short term expense even if they agree it's against their long term expense? Lots of successful short-term fun, long-term negative products out there in the world, and we rarely expect - or see - the free market alone to make those products go away.
The products in that category you see succeeding are survivorship bias, like cigarettes. Which only works because it builds a physical dependency.
But maybe the algorithm is like nicotine and it's hard to break the habit. We can still win, because we can offer the same algorithm, because we can offer more than one. So you switch because you aspire to quit. You want the option. And you don't have to quit today, you can switch and keep the addictive one.
But then you have a choice. You can turn it off when you're feeling strong. Wean yourself. Time lock the bad one in your client.
Which eventually makes it easier to quit smoking altogether.
People who don't want it have moved on.
Facebook is like Congress. People like their part but hate the other parts.