Twitter might some day remove the block button? They might some day push certain people on you, without recourse? Therefore, they have to ban these people now?
There is no concern here, as I do not use Twitter.
Rather it was an attempt at an simple example to explain to you the differences in control that a user of an open protocol has, versus the control a user in a closed ecosystem like Twitter has.
Twitter might some day remove the block button? They might some day push certain people on you, without recourse? Therefore, they have to ban these people now?