Not quite sure why you think subscriptions will protect you from crazies. The subscription model will not replace ad revenue as the dominate revenue model at Twitter. Musk hopes it will help Twitter survive his ownership. Therefore people not paying the subscription will still see ads when viewing your content. If they happen to be "crazy" they will still harass you.
The reason there are no ads in the "Daily Stormer". No one but neo Nazis read it. Since - thank God - there are only a small number of such people (currently) the market for things that would interest the neo Nazi demographic is small and hardly worth the cost of offending those of us that find neo Nazis offensive or maybe even evil. Given the state Twitter is in - Musk would likely throw his support behind the "Daily Stormer" if he thought it would bring in revenue.