Yes, that should not be a problem. My rather elementary understanding of the GPL suggests that it allows you to use it for whatever you want to use it for, even for a site that is behind a paywall... but the source code has to remain open-sourced.
If you have no intention of forking and selling a customised version of NodeBB, then I think you're pretty much in the clear 😄
Is there anything else that I need to follow to host NodeBB on digital ocean with mongodb as database?
I m reading through the NodeBB docs and following the links by order but was wondering is there anything else that I need to know about?
And the digital ocean guide is 2 years old and wondering if there's changes in things that I m not aware of.