Though most Twitter users take the service for granted, in reality Twitter is providing free web hosting and other services hoping to make money from advertising. While the major brands have a lot of money to advertise, they are very selective in choosing the websites where they will advertise. They will usually not advertise on websites which have controversial content, especially protesting against corruption, nepotism since they are part of the system.
So if the top brands stop their advertising on twitter, the advertising revenues of twitter will decline, and the only way twitter will make some money is by charging its top users for its webhosting and other services which it offers for free at present.
Before twitter became popular after 2010, most businesses, government agencies largely relied on their own website, which they developed investing money on webhosting, domains, website development, maintenance
So while social media websites have a large number of users, and some like Facebook are making a profit, they have effectively destroyed domain investors, webhosting companies whose clients prefer to use the free web hosting of Twitter, Facebook and others and make losses.
Most of the twitter top users are making plenty of money, they can easily afford to pay $20 a month for the twitter web hosting services, so when twitter starts charging users some money, domain investors making a loss for the last decade, will also make some money.