Sweeney's a prick, but putting his self-aggrandising bluster and stupid language about "Apple taxes" to one side, he's kind of right here.
Apple's implementation of side loading is garbage, designed to fleece developers by adding junk charges and making the whole thing unattractive. I think they're charging a 0.50 Euro charge on each app download once you go over 1m downloads on third party stores. That's some Unity-level dogshit designed to make sideloading as unattractive as they possibly could. Unless I'm reading it wrong, an app that has 1m free downloads (for example, an open source app barred from the App store but allowed on third party stores, like console emulators) will be charged half a million Euros or more if the number of free downloads passes 1m.
I don't think Apple could've been more hostile to developers wanting to sell on a non-Apple store. I'm sure their lawyers have maliciously complied with the letter of the law in the EU, but I think Apple are being intentionally provocative here. Apple clearly wants opening up of iOS to fail, lest customers outside the EU start demanding the same features.
I'm curious to see how the EU reacts, because this is some anti-competitive BS and is almost certainly not the outcome the EU wanted.
Edit: Looks like the 0.50 Euro charge is all "first time downloads" after the first million. Still bullshit if you're distributing a free app - you basically have to cap your downloads at 1m. Utterly insane.