> You can just accept that people may use the term "blockclock" to talk about block clocks.

That doesn't work if an adversarial company files the trademark instead. An evil version of Djuri could have taken down Coinkite's Github and hosting that way. If he had trademarked BTCClock and there no Blockclock trademark already.

The only defense against such an attack is already having a trademark, because that is the only way you're going to quickly and successfully appeal a takedown.