That makes absolutely no sense to me. If I get an offer from a bank that $200 is available to me if I open a checking account with them, then do I have to report it as income even if I don't open an account or perform any action to go after it?
The tip4commit payment is a tip paid because of work you did; elsewhere in IRS pub 525 and pub 531 it's clear (well, as clear as any IRS document ever is) that tips count as income.
the checking account offer isn't compensation for something you've already done. I think that makes it clearly distinguishable. But I'm not a lawyer; get competent legal advice before deciding you can pretend a tip-for-commit payment didn't happen.
That depends. The difference here is that they are doing the bitcoin equivalent of leaving money on the table after you did unrelated work. Yea you have to reach down to the table and take it. But the IRS is saying until you do something about it, it counts as income because you effectively own it.
But again, lawyers haven't finished discussing all the legal ramifications of crypto-currencies or for that matter the internet in general.