Jason Kottke re: Medium's announcement and why he chose not to move Kottke.org to Medium:
New businesses are unstable…that’s just the way it is.
In Silicon Valley (and in other startup-rich areas), these unstable businesses have lots of someone else’s money to throw around — which makes them appear more stable in the short term — but they cannot escape the reality of the extreme risk involved in building a new business, particularly a business that needs to grow quickly (as almost all VC-backed startups are required to do).
And, how he combines services on his own domain:
With kottke.org, even though it hasn’t been easy, I’ve opted for independence and control over a potential rocketship ride. Instead of moving the site to Medium or Tumblr or focusing my activities on one social network or another, I use third-party services like The Deck, Amazon Associates, Stripe, and Memberful that plug in to the site. Small pieces loosely joined, not a monolithic solution. If necessary, I can switch any of them out for a comparable service and am therefore not as subject to any potential change in business goals by these companies. Given the news out of Medium, I’m increasingly happy that I’ve decided to do it this way (with your very kind assistance).
See also; this, this, this, and all of these.