TrueType Fonts in Linux Distributions?

Kypeli asks: "I just got the TrueType fonts working on my X (finally!!). Now that I can use these wonderful TrueType fonts, I have been wondering why can't TrueType fonts be included as default in the Linux distributions? At least in my opinion Postscript fonts suck deeply." A large number of TrueType fonts are not free, but I'm sure there are some out there. Why /aren't/ TrueType fonts included in distributions these days, especially now that Linux has support for them?