<p>First of all, as already said in @gung's comment, <a href="https://stats.stackexchange.com/help/on-topic">CrossValidated <em>is</em> the site to ask questions on machine learning</a>. Many machine learning questions (mostly those that focus on coding issues) are also <a href="https://stackoverflow.com/search?q=[machine-learning]">asked and answered on Stack Overflow</a>.</p>

<p>Moreover, if you search <a href="https://area51.stackexchange.com/">Area51</a>, you'll see that there were already two proposals for "Machine Learning" sites, but <strong>they were closed</strong> mostly because of small traffic and a small number of active users.</p>

<p><a href="https://i.stack.imgur.com/yLbD9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yLbD9.png" alt="enter image description here"></a></p>

<p>Additionally, there is also a <a href="https://datascience.stackexchange.com/">Data Science SE site</a>, that has very similar scope to Cross Validated. <a href="https://stats.meta.stackexchange.com/search?q=data%20science">We discussed it many times</a>. The general conclusion of users of Cross Validated is that the Data Science site is redundant given Cross Validated, so  the same would apply to any Machine Learning site.</p>
