That seems to be less a narrowing and more adding information to candidates about what the job actually will be. You've just added candidates who want to work

That seems to be less a narrowing and more adding information to candidates about what the job actually will be. You've just added candidates who want to work for gaming and are able to do live video to the pool of people who can do live video and don't really care what kind of video it is. Providing accurate information about the company allows job seekers to self-select, increasing the signal, and offering an interesting application is far more likely to attract top talent than advertising for code monkeys.