Netflix would not remotely resemble its current form and likely would have been acquired years ago if they did not pivot to their own content. Switching to their own content required and still requires huge amounts of money; est. 17bn last year[0]. Additionally, the gross profit number is a flawed number for many reasons; try looking at operating or net income or anything farther down the income statement from basic revenue. Netflix has no option but to finance content spend with debt as they do not generate enough FCF to cover content spend and will quickly fall behind competitors if they don't.
[0] https://www.pcmag.com/news/netflix-will-probably-spend-19-bi...