Question for founders. Why are companies choosing to write information and updates on a separate newsletter website like medium or Paragraph instead of on the website itself? 

As a potential user/customer, I find it a bit frustrating. I miss websites w proper blogs

not a founder but my simple answer is that we got used to get update from these newsletter websites, instead of going to the project’s own website to find for update everyday

And it takes way more time and efforts to update website than simply throwing a newsletter 👌