Creating a tool like GSA must not be the hardest part but maintaining it is. For instance, anyone can purchase a GSA tool with a one time payment and receive unlimited updates even for 5 to 10 years for free. Also, you will need a lot of marketting skills and stay ahead of the game with the search engine updates to ensure that the users of your tool are good to when they meets those new updates.
Account creation takes ongoing development and maintenance not to mention captcha solution and proxies at scale.
Bot builders / Automation experts are everywhere, take a look around.
Fact is, you cant build something like rankerx/mr for less than rankerx/mr itself![]()