Everything everywhere for all time has been a remix.
We build on our priors, things we heard and absorbed in the past, and extend them in ways we vote are interesting or innovative.
Before computers and the internet, this process was illegible and hard to detect.
On the internet it can sometimes be extremely easy to see.
Our intellectual property schemes all assume total ownership over the work you made, as long as it's sufficiently different from things others have copyrighted.
How much should your remix be worth?
First, assume that the ecosystem does find the remix valuable, and everyone wants to figure out who should get what proportion of the credit.
Conceptually the value of the tweak is tied to "if you hadn't done that, how long would it take for someone else in the swarm of the ecosystem to make effectively the same tweak?"
If it's "literally seconds later" then there isn't much value that the creator should get credit for.
If it's "thousands of years" then its' extremely valuable.
Note that it's not just the tweak, but deciding to build on that particular combination of inputs, out of the universe of all possible inputs, that is the innovation.