I'd be very surprised if it's more than 2, maybe 3 people on software....
And from what I can tell, I think the whole company is probably less than 10 people....
Think Planet is literally 'operating on a shoestring' (ie, under-capitalized...) and trying to 'bootstrap' themselves into a larger company.
Having run my own business in the past, this a very difficult road to take, if you want to be able to scale up to have more production and sales volume and efficiencies therein, and be able to afford adequate support resources, etc. Think Planet is in a very difficult position and unless they have a 'big hit' in the marketplace, they will find themselves unable to get out of this position, unless a bigger company buys them out.
Wish Planet all the best though....
Meanwhile, let's hope we see a good v22 released soon!
Just my 2 cents....
Mark