I just don’t see how that’s workable as a business strategy. If Twitter charges you for a blue check, the social value of the mark will go down. If they simultaneously charge higher prices based on the wealth of the subscriber, that’s asking wealthy tweeters for a lot of money for something whose value has been significantly diluted.

It depends on if they still have the notability requirement; if they just charge $20 and anyone can get it then it definitely devalues the whole thing (the whole value of the mark other than as a signal is access to DM other notable people; if anyone can pay $20 to DM celebrities and stuff celebrities will turn off blue check mark DMs or if there is no option just ignore DMs entirely, which then kills the journalism loop on Twitter where journalists get access to celebrities, politicians, etc. by having the mark).