If right and wrong are important then "legitimate" encompass them. So it s possible for something to be legal but not legitimate.

There are not a lot of legal but absolutely immoral (the other way, illegal but legitimate - plenty) the actions of the FANG IMO definitely fall into the category of legal but illegitimate.

Because to me good and evil are important considerations

Here are two (abridged) definitions from the Oxford dictionary:

1. conforming to the law or to rules

2. make legitimate; justify or make lawful.

You're choosing to ignore the verb make in the second definition, describing the act of conferring legitimacy on something, which necessarily implies that it was previously lacking.