It's still good if you minimize their impact.

A similar example is sending garbage to China. At a certain point China stopped accepting it. Hopefully soon others will do the same and recycling will be tackled correctly.

Good luck for them in competing with somebody that has the network effect of being available everywhere.

The network effects has its limits. Messengers and social media platforms have so far resisted a winner-takes-all situation. Since social networks are still more often than not rooted within geographical boundaries, it's possible for competitors to coexist on a global level.