Where it expands
Depth rather than breadth. This Jupiter's returns come from going all the way into one subject, one field, one person, and staying past the point where the interesting part was over.
The tradition associates the placement with other people's resources — inheritances, joint finances, the money that arrives through an arrangement rather than a wage. That association is folklore rather than a demonstrated pattern, but the placement's comfort with entanglement is real enough.
What it overdoes
Intensity. Everything is entered at full commitment, including things that only warranted a look, and withdrawing later costs far more than a lighter involvement would have.
It also overdoes conviction. Having gone deep into something, this Jupiter treats its own experience of it as general law, and it does not hold beliefs provisionally.
What it is actually generous about
Loyalty, and it is expensive loyalty. This Jupiter will spend money, time and reputation on a small number of people without a limit being set anywhere.
It also gives access to what it knows, which for this placement is the significant gift. What it does not give is casual warmth, and people who need that read the whole arrangement as withheld.
Why the dignity is what it is
Jupiter is peregrine in Scorpio. Mars rules the sign traditionally and Pluto in the modern scheme; Jupiter holds no dignity or debility under either reading.
Lacking a footing, Jupiter works to the sign's method — fixed water concentrates and does not disperse, so expansion happens by depth rather than by extension. Dignity describes the fit between planet and sign, which is a separate question from whether the placement produces a good life.
Against the opposite sign
Jupiter in Scorpio faces Jupiter in Taurus, which grows by keeping and enjoying rather than by going through anything. Scorpio treats a comfortable accumulation as stagnation; Taurus treats a voluntary loss as damage.
The axis is one problem seen twice. Scorpio's development is allowing something to be pleasant without investigating it or committing to it entirely, which it tends to acquire only when exhaustion forces the experiment.
Questions people ask about this
Does Jupiter in Scorpio mean inheritance?
The tradition links the placement to shared and inherited resources. That is folklore rather than an established fact, and no placement produces money by itself.
What does this Jupiter overdo?
Commitment. Things are entered at full depth that only warranted a look, and leaving them costs accordingly.
Why is Jupiter peregrine in Scorpio?
Dignity names fit, not grade. Jupiter has no traditional dignity in Scorpio under either the Mars or the Pluto rulership.