The reason is because the cartel needs to gradually consume the hashrate of the network, so it can delay the transactions of non-cartel customers who are on the blockchain. To force them to join the cartel or lose customers to the cartel.
Why?
You think they will create transactions that don't need to exist, just so that they can not send them out to the rest of the network?
You are confusing the cartel's transactions with the non-cartel transactions. The later are the ones that get delay. The cartel's miner excludes them when adding a block solution to the block chain.
I agree that one of us is confused, but I'm not sure it is me.
In your original post, you said:
Quote
But a cartel (e.g. Amazon.com) could for example harvest transactions from its vast network and keep them without forwarding them to other miners. Then put them on the blocks found by its own mining servers.
ie. The cartel would withhold their transactions from other miners' blocks.
Now you are saying that they would withhold other peoples' transactions from their blocks.
That is a completely different issue.
Yup. I had mentioned both of these upthread. What took so long.
Well thanks for joining the party.