Every time you make an HTTP request, your headers betray you. It's the User Agent (UA) but also the rest of the strings. So what can you do?
Popular open-source tools and their plugins are only partial helpers because they don't fix the entire header challenge and only work on a small scale. They're the tip of the iceberg.
Handcrafting is painful: Even customizing and randomizing UAs, you soon realize error screens don't disappear easily. There are hidden rules, untold patterns, and maintenance is required.