Being 'at the whims' of whoever maintains the blocklist isn't unique to this style of moderation - when it's Twitter, you're at the whims of the company - but a

Being 'at the whims' of whoever maintains the blocklist isn't unique to this style of moderation - when it's Twitter, you're at the whims of the company - but at least it means you can use other blocklists if/when the good ones go to shit, or can start a community-ran blocklist.