Last month X said a new "block" feature would be introduced that would allow people who have been blocked to read your posts. This unsolicited feature received negative criticism for allegedly making it easier for stalkers to carry out their activities.
Over the weekend, X said the new barrier feature was rolling out to some users. The feature is being activated in stages with the activation criteria still vague. So far the average is from users living in the United States.
X's action to change the way this "block" works is seen to violate some of the application conditions set by Google and Apple. But till now both the app stores are yet to pull the app from download. The only way to prevent the tweets from being read is to make the account private. If you don't want to be read by a blocked account, this is the only step that can be taken now.