Skepticism about Typekit

From the post announcing Typekit:

While it’s technically quite easy to link to fonts, it’s legally more nuanced. [...] We’ve built a technology platform that lets us to host both free and commercial fonts in a way that is incredibly fast, smoothes out differences in how browsers handle type, and offers the level of protection that type designers need without resorting to annoying and ineffective DRM.

We’ll offer a free version of the service to get you started, and a low-cost way to grow from there.

There are plenty of reasons to be excited about Typekit, but the reactions I’ve heard so far are mixed. Things like, “Why should I pay to ‘rent’ fonts if I own them?” and “If I use a typeface with Typekit, then cancel my subscription, does my website lose that typeface?”

What I know is this: Typekit will provide an extensive FAQ. You and I can help with that by asking the questions we’d like to have answered. Why might you not use Typekit?