A lot of content marketing these days is low-effort and spammy but this is a great example of content marketing done well.
I learned so much though about how different manufacturers do things, where they cut corners, where they invest.
One crazy thing I learned was that almost all of the KN95s on amazing were not following the GB2626-2019 ("KN95") mask spec.... even though it's not that hard. So I decided to make a KN95 that followed the spec! Great way to really get into the product.