The point is to commoditize yourself so that's not unexpected. The brand (you) has to get good at targeting the audience they are selling product (yourself) to

The point is to commoditize yourself so that's not unexpected. The brand (you) has to get good at targeting the audience they are selling product (yourself) to and avoid interacting with the competition or getting run over by trolls. Protecting the brand (yourself) is important. To distinguish the brand (yourself) from others, the brand (you) has to set something people can look up to as a way to differentiate their experience with them (you). What the brand (you) likes, follows, engages with etc defines the image of them (you) and the right market fit (their feed). Accessibility is a huge factor for a commodity (sellable parts of you as a whole) whilst some blocking may be necessary for setting the cultural expectations for the brand (you). If the brand (you) block people from certain group and it is public, that might work as a signal for what the brand (you) stands for. Let's suppose the brand (I) blocks a mark Zuckerberg and Facebook, then that works as a signal for that the brand (I) cares about privacy and against people who exploit that. If the brand (I) only uses English to tweet, then that might be a signal for which audience product (I) is made for. If the brands (yours) block list isn't diverse, it might signal as a racial/ethnic/gender/sex bias.