Canada

I don’t doubt that there are some out there, all I’m saying is that I haven’t seen anything to suggest they’re not a small minority.

Some ambiguity here - did you mean folks disliking Hamas (which I provided the survey showing it's at 52%) or folks who like Israel (using folks who dislike the US as a proxy, suggests less than half).

Oppressed people have protested publicly in many other countries but we don’t hear anything from the Palestinians against Hamas

I think this is answered by the C.S.M. article,

“People now are very angry with Hamas, but at the same time they are afraid to express the anger inside them by protesting or holding sit-ins,” notes Wael Mohammad, a civil engineer and longtime Hamas critic in Gaza.
Despite the rising anger, fear persists amid occasional reports of mosque imams or civil society organizers being dragged off and “disappeared” by Hamas for voicing public criticism.

Also,

Why don’t we hear anything about underground Palestinian peace movements?

I mean, we do. From the same C.S.M. article,

Protesters gathering in northern Gaza were shot at by armed men.

Finally,

Where are the videos of people denouncing Hamas?

Maybe an infrastructure issue, they're not able to take videos because of a lack of electrical power - or can't upload them due to a lack of internet connectivity? Not sure. But reporters on the ground are saying that this is indeed happening.

why aren’t people taking to the streets to celebrate?

Aren't they too busy evacuating? As per the orders of the IDF? Except for those in an area with a strong Hamas presence still - those would be too afraid to go out.

Which comes back to my earlier question, even if it really is just a small minority,

I'm not clear on how would even a pro-Israeli Zionist who lives in Gaza and is ethnically Palestinian could get registered as a friend to pro-Israeli forces.