The newly restored blue checkmarks are another example of a partial reversal for Twitter, which took down the legacy verified badges for nearly all of the accounts that had them just a few days ago.
Twitter checkmark RSS
Now the only way you can have a blue "Verified" checkmark on your Twitter page is to pay $8 a month for a Twitter Blue subscription that also comes with a number of other features.
Twitter was expected to remove verified checkmarks from older, non-paying, accounts this weekend, but the social network decided instead to label them as having a "legacy verified account."
The option to either show or hide the Twitter Blue checkmark was discovered in the social network's code by an app developer, but this feature could end up not going live to the general public.