Communities do have good contributors that make good content. Speaking to Pokemon GO, announcements are often wordy and lack key information (which pokemon can be shiny, for example). It's up to the community to post helpful infographics when events start to give a concise and accurate overview. In many instances, blocking top contributors will also block the best content.

Totally different story when talking about big, general topic subs like memes, news, etc. But why would you even browse those in the first place?