You’re not going to believe this, but I’ve got an even better suggestion! Easy to remember too: it’s just one word, and it happens to be the same the previous advice started with.

0.9438Hz, i.e. 1*(2^(-100/1200)) IIRC.

Well, yes. But that’d require fair, sensible distribution and use of available resources, and then how would we be able to support the ability of a handful of billionaires to subvert our democracies for their own gain? /s

Um. If you use the file encrypted with a weak keyphrase a the key for a second round, how would you decrypt the result unless you keep the first-stage encrypted file around, thus defeating the purpose?

Alternatively, you could use a browser instead of an advertisement delivery app.