As commented by @Aaron:
There is an option to include a message in the bounty, which will be
displayed prominently with the bounty.
In this case the message written by the person placing the bounty was:
Offering a bounty to refresh this question to current day. Also to
encourage people to flesh out how to use [conda] and it's packages if
you've installed [QGIS] the normal way, rather [than] through conda
Also, with respect to:
how can you guess that person's current problem if he or she can't
change/rephrase the original question (which should be avoided, imho)
to adapt to his or her current situation?
my understanding of SE site design is that anyone in the community, especially its author but even anonymous users (see How do suggested edits work?), can at any time revise/change/rephrase a question as long as those edits do not cause it to become a candidate for closure or invalidate any of the existing answers. The remedy for either of those italicized eventualities is rollback.
The aim is always to evolve our Q&As into each being a clear question with one or more clear answers that directly address it. Starting bounties is one way to promote that happening but editing can be used to improve Q&As at any time in many ways.
It is fine to ask a new question if the reason it should not be a duplicate is made clear, and the community agrees, by not closing it, that the difference is sufficient to warrant a new question.
It is fine to comment but comments are temporary and intended only to seek question clarifications, so they are not intended to remain on the site indefinitely.