[bevr1337]

I couldn't find an easy answer on the wiki or site, but I am using my phone instead of a desktop.

Do users still need to obtain (an obviously legal, Nintendo approved) ROM of classic OOT to use the randomizer?

[whaleofatw2022]

Yes. Typically randomizers take the input rom (or data from a CD in the case of something like SOTN) and use that as a starting point.