>>raveni+8Gm
There was an early rule that Rust keywords should be five characters or less. I would guess it's because of this rule. I believe loop turned into cont to satisfy this rule, and then eventually we relaxed the rule, and it became continue.
>>iknows+qVm
Probably for the same reason that most new language these days cannot bring themselves to just use "function" and instead have "fn", "fun", "func", etc. It's a headlong pursuit of conciseness for the sake of conciseness.