@Gargron It is incredible if it is obvious the benefits of the net effects. Tumblr could adopt the WordPress model of having most of the software free and Open Source for anyone to host their own instance, or offer a paid hosting service that handles all updates and maintenance. Generating revenue from 5% of 3 million is better than 100% of 100k.

"WordPress now powers 43.3% of websites, with a 65.1% share in the CMS market.”

kinsta.com/blog/wordpress-stat
colorlib.com/wp/wordpress-stat

If the people inside Tumblr look at these WP stats and do not see how Tumblr would benefit from an open model they are completely missing out.