No. Developers are supposed to pay to access the hard work of the technical writers and developers who maintain MDN. I don't understand why you think it's self-evident that this work should be free.
Here is a longer explanation by the person who created the precursor to MDN: https://www.quirksmode.org/blog/archives/2020/08/i_love_mdn_...
Here is the HN thread: https://news.ycombinator.com/item?id=24159244
I lead of Chrome DevRel team and we contribute with tech writer support and work on the PAB, it appears too little still but there are many web standards aligned companies that could provide more support because they directly benefit from MDNs existence.
- Sponsor for $ a month: https://developer.mozilla.org/en-US/payments/
- Buy Merch: https://shop.spreadshirt.com/mdn-store/