"did not cause any harm" - for a very loose defintion of harm. Sure it could have been much worse. But enough ground and water was contaminated, and much more will be in the future when they run out of storage.
It is still improved. The actually also want to add this kind of check-in (almost done) but it might be blocked by apple/google as the terms of use of the contact tracing API forbids use of additional data.
Neither is right. CCC also has security experts as members, which sometimes comment publicly. In general however, it is the parent organization for local hacker spaces (though it is possible to be member on only local or only CCC level). And many local spaces are also called ccc-xy. Wnd their interests.
I don't get how anyone can call it beautiful and productive. Ever take over/inherit some 'older' node code and try to update it or even get to work... it is hell. Even worse if it is from the time when there were competing forks of nodejs, so you have to try to figure out which it prefers. And maybe even then it won't run. (probably because npm's version notation can be unpredictable, so npm install still installs a version that breaks something even though it shouldn't)
Except they don't fluctuate, there is just a certain amount of lower fares (going up in stages, the closer you get to the travel date and depending if all tickets of that category were booked already). This is know in advance, and the maximum price is always fixed. So quite different.