The terms 'competitive bid' and 'competitive auction' come up regularly. I have a rough understanding of what they mean, but would welcome clarification.
I have read that in the first example there is no room for West to show both a competitive and an invitational bid. East should assume that West's 3♥ is competitive, i.e. stretching a bit and prepared to make a profitable sacrifice, so East should pass.
I assume that in the second example, as South has passed, the auction is no longer competitive (for the time being), and West's bid is invitational.