Twitter announced Friday it is testing an in-app payment feature called Tip Jar
It lets users send money directly to their favorite accounts via the app
Some users are comparing the service to that of the adult content site OnlyFans
OnlyFans lets creators charge a monthly subscription for their unique content
Although the site says it is for all topics, many creators post adult content
Twitter says it will not take a cut of tips, while OnlyFans takes 20 percent