Just wait until they eventually are greeted with a notice "Sorry, we've blocked all users from Europe due to the new copyright reform" on every major social media site/app.
Sadly neither will happen. The major social media sites and apps were too silent this time around. Back in 2012 when ACTA was voted on there was much more activity.
Since Youtube and Facebook etc. already have filter mechanisms in place they probably want to profit from it by selling it as a SAAS to smaller companies that don't have the resources to implement their own filtering.
I was right.
Although I remember plenty of comments on HN about how Facebook et al. would be blocking EU users because it would be too expensive for them to comply with GDPR.
One or two US based newspaper websites were all I noticed blocking access because of compliance reasons. I expect a similar impact due to Article 13.
Still others present a "subscription required" page if you connect from Europe, but display the content if you access them from the US (or through archive.is).