When boot from UEFI. I get a logo screen then when click "e" I can see a GRUB but I don't know what to put them or go to terminal and changing grub.
That's means pop want be second "apple" - company. They build something new, interesting will be open source gnu license or non-free?
Not necessarily.
ZorinGroup has also tossed around the idea of moving everything to their own repositories.
It will be new chapter for Linux maybe will be better with new solutions for users.
I tried POP_OS! but the fact that you couldn't add anything to your desktop out of the box turned me away quickly. What's the point of a desktop if I can't temporarily drag and drop files there? If it wasn't for that, I may have stayed with it (at least on my laptop).
POP_OS! This is company with they vision and future, how system must be for they how they liked. That is the price creators POP_OS! You never know what will be next year with POP_OS! It could be if they out nev version POP and new GUI where you will be searching something and don't know where is it.