There will almost always be a lot of people thinking about and/or working on the same ideas that one is thinking about. Others working on them might have dedica

There will almost always be a lot of people thinking about and/or working on the same ideas that one is thinking about. Others working on them might have dedicated certain amount of resources to accomplish a certain pace of progress. If one makes their plans public, it might inpsire others to bring in more resources to increase their pace and beat you to the market. In such acase all one would be doing is provide free marketing for that product. Of course, this is just one perspective. Going public also has its advantages, just like going in stealth mode has its disadvantages, one of them being the difficulty of attracting talent. At the end, what matters is which option one chooses to leverage that option's advantages and what one does or can do to nullify the disadvantages of the same option.