The regulation in question is
|Quote: EBU Orange book 1998|
5.2 Basic Rules
5.2.1 You must alert a call if
(a) it is not 'natural' (see 5.3).
(b) it is natural, but you have an agreement by which it is forcing or non-forcing in a way that your opponents are unlikely to expect.
(c) it is natural, but its meaning is affected by other agreements which your opponents are unlikely to expect.
The wording of (c) which is what you are querying was designed to suggest that a fairly normal treatment does not need an alert.
Let us look at your examples.
Example 1 seems to be easy since it is quoted in the Orange book - see 5.4.3(f). It is not alertable.
Several people have been extremely rude about that item, and it has probably got more bad press than anything else in alerting. I suggest alerting it would be a good idea: too many people think the Committee got that one wrong.
Examples 2 and 3 are borderline. Quite frankly there is a case for alerting in each case, probably more so in Example 3 than Example 2, because in Example 2 other bids show strong hands with or without the good-bad approach. Even in Example 3 you could ask "Do they really not expect this?"
To be honest, I think all three examples are fairly borderline!