Others have already given possible reasons, another might be that they don't want to accept certain jobs or opportunities and are overly selective. They may not

Others have already given possible reasons, another might be that they don't want to accept certain jobs or opportunities and are overly selective. They may not want to work yet but are adding any offers to the pile to negotiate better later. I know a similar person who is good with designing distributed systems and programming in general. They had a offer from facebook but declined. They want to get a good paying cybersec job but alas there aren't any at good companies. Currently working on gigs and being broke.