Only disabling half of the ads makes sense from a business point of view. Most likely, the users who are the best audience for an ad (in the sense that they hav

Only disabling half of the ads makes sense from a business point of view. Most likely, the users who are the best audience for an ad (in the sense that they have spare money and might purchase an advertised product) are the ones that would actually spend money disable ads. There will probably be a new advertisement segment for users of Twitter blue. Companies will be able to advertise specifically to users willing to pay to disable ads aka more likely to have disposable income. Premium ads for the high spenders.