Changing robots.txt does not delete content from their archives. If you remove the robots.txt file, the content becomes viewable again.
There's no scenario where they can respond to the vast scale of GDPR violations that their archive likely represents, when it comes to manually removing content. There are only three possibilities: avoid the EU as much as possible, dump the archives and start over with an entirely different approach, or shut down. Besides that, these laws are going to get a lot more strict and difficult to comply with, not less strict, over time. This is merely the beginning of aggressive regulation of the Internet. Regulation of the Internet will only move one direction from here, in the direction of increasing burden and ever greater regulation. It's hard to imagine Archive.org's archives surviving what's coming.
There's no scenario where they can respond to the vast scale of GDPR violations that their archive likely represents, when it comes to manually removing content.
"GDPR violations". What's that, exactly? As far as I know, you only have to remove personal data upon request, no preemptively. So I don't see how they are "violations".
Will a lot of people make these requests? Possibly, but where's the evidence of that? People have been able to use copyright takedown requests (e.g. under the DMCA) forever, yet the Archive is still around.
Actually the recommended data handling says you should specifically state the purpose for needing the data, and that it should be reasonably limited to that need; i.e. if you don't need it any more you should pro-actively delete it.[0]
There's no scenario where they can respond to the vast scale of GDPR violations that their archive likely represents, when it comes to manually removing content. There are only three possibilities: avoid the EU as much as possible, dump the archives and start over with an entirely different approach, or shut down. Besides that, these laws are going to get a lot more strict and difficult to comply with, not less strict, over time. This is merely the beginning of aggressive regulation of the Internet. Regulation of the Internet will only move one direction from here, in the direction of increasing burden and ever greater regulation. It's hard to imagine Archive.org's archives surviving what's coming.