[chr1]

There is a difference between cases when business needs to spend effort to assist you, and when it needs to spend effort to prevent you. Here preventing is actually harder, because there is no difference to AWS/Twitter which combination of numbers it stores and it has to go out of its way to read the number and block specifically your speech.

[cyrus_]

The dominant cost here isn't the cost of the employee that has to update their database, it is the cost of lost advertising or customers angry that your company is providing services to terrorists.

[chr1]

If twitter had done this for advertisers and the customers, their price of their shares would not fall.