> Just what I said in the GP: anyone interested in FLOSS
Except we're not monolithic. We each have our reasons, and one person's rationale for open sourcing (and with what license) may vary by project and with time.
> It may be the case that in 2024, lots of people "do open source" as part of a business strategy. But I can assure that it was not so in 1986 [...]
Not explicitly, perhaps, but already in the 70s there was something of an understanding of mind-share. Building mind-share is easily (IMO) the most important reason to go open source for any given project, though there's others too.