If you have root access you do not need sudo. See sudo - Wikipedia
It depends on the configuration of the sudoers file, but most of the time sudo access will suffice for the term "root". Often you can just do sudo su - and voila, you're root.
I'm not familiar enought with Termux to say if running sudo from within Termux is equal to being root in the Android environment "outside" Termux.
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You probably can. If root can bind port 80 on android, that I am not sure and I think depends on the single phone.
I tried. nginx on termux runs on port 8080 by default and to get port 80 you'd have to run the daemon as root, and that's not a good idea. Use @Osiris 's idea to port-translate using ipv4. 
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To use an old phone instead of a Raspberry Pi to host your pet projects?
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Personally, I would very much prefer a RPi above an older phone. Unless you can perhaps flash the entire phone with a non-Android operating system 
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I agree. RPis have gotten expensive, tho. Other SBCs as well.
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I haven't seen may OS available on cellphones.
Like FreeBSD, OpenBSD, Modula-2 - Wikipedia, VAX - Wikipedia, Burroughs Large Systems - Wikipedia, Burroughs Medium Systems - Wikipedia, CDC Cyber - Wikipedia, HP Time-Shared BASIC - Wikipedia, Minix - Wikipedia, https://minix3.org/, Xinu - Wikipedia, https://xinu.cs.purdue.edu/
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