I think it'd be a hard sell to smaller teams, but _maybe_ to organisations that are a bit older or larger and have accumulated a lot of internal cruft. I definitely think it would have been valuable at some of my previous workplaces: at one we had an event log with 12+ different types of transactions and no one in the office could tell me what all 12 meant. I found this out because I was tasked with telling a 3rd party what they meant =/

On a different note - have you consisdered doing some content marketing by making a public jargonaut for common development terms? My little brother is learning to code and he just asked me what the difference between .NET and C# was. I think learning programming is like this x10000 times. I've been daydreaming about making a public Wikipedia-style tech glossary site for at least a year or so. I think it'd be very useful but haven't gotten around to it (in a year so what does that tell you).