If you are a simulation, then your choice doesn't matter. You will never get any real benefit from the boxes. It's like saying, "there is also a finite possibility that the machine is lying and all the boxes are empty". In which case, the choice is again irrelevant.
Situations in which your choice doesn't matter are not worth considering. Only the remaining possibility, that you are not a simulation and the machine is not lying, is worth considering.
But if it's true that the machine can perfectly predict what you will choose, then by definition your choice will be the same its prediction. In which case, you should choose one box.
Regardless of whether the machine is right, if you don't believe it can perfectly predict what you'll do then taking both boxes is always better than just one.
If you want to command something in the water, you run a wire from that something to a receiver in the cabin.
It's much easier if you reframe the problem:
Someone says they've built a machine that can perfectly predict what you will do. Do you believe them?
If so, take one box.
If not, take both boxes.
If set up properly, Mastodon can pull in Lemmy and Kbin posts and comments. What is Mastodon trying to be?
The answer in both cases: it depends on how you set them up.
It was a private message. It's not going to be actionable as defamation.
That's equivalent to one metric bag.
That's like saying Microsoft and Sony need to settle on either "Gamertag" or "PSNID", because otherwise Call of Duty players trying to find their friends online will be confused.
I think users can figure things out.
True, but it's important to note that personal data means identifiers such as name, date of birth, location, etc. Comments on a blog, by themselves, are not personal data.
This is a good article on whether non-EU websites have to obey the GDPR. It boils down to two criteria:
If your business is offering goods or services, irrespective of whether a payment of the data subject is required, to such data subjects in the EU
or
If your business monitors the behavior of EU citizens and their behavior takes place within the union.
The latter includes use of advertising cookies, location tracking, etc.
If neither of those apply, you can probably ignore the GDPR.
Whatever that rule is, I bet the mods at /r/interestingasfuck are ready to enforce it.