Your sentiment is well taken, and just for reference I'm a Debian fan of some 13 years (I've run Debian [and various BSD flavors] on all my core infrastructure for ages, and have worked as a senior engineer responsible for hundreds of Ubuntu hosts containing thousands of virtualized Linux guests of varying distros). That said, Canonical has actually done a decent job of promoting Ubuntu, and it's a fact that getting people introduced to Ubuntu first and other distros later (owing to the DFSG, which is a good thing, but only tenable under certain conditions) has been a somewhat easier route than some others in terms of helping kids discover open operating systems.
I am not a lawyer, but I do have extensive experience in contract composition and review, along with extensive experience in trademark protection. This is precisely why I contacted Canonical before printing any kite sails, but I was still disappointed with the outcome. Again, oh well.
Just to make things clear, you're certainly right that alternatives exist. That said, you should be aware that various other projects also enjoy protection under United States trademark laws, although they are far less hostile than Canonical in my experience.