Interesting... I wasn't aware that the users were indirectly populating the database for AirNav, or how they did it. I'd have thought AirNav would have people or perhaps multiple sources of information and be correlating the info themselves.
I think that you are missing the point here somewhat. There is no complete worldwide aircraft database as far as I'm aware. I'm sure that all the licencing authorities of individual countries have such databases (G-INFO for the UK for instance), but not one database.
When RadarBox was first launched, you got the database that came with it and that was it. You could manually update the database using Database Explorer (as you still can), but there was no integration with any on-line sources.
AirNav worked with the GAS team to arrange access to the GAS data and I'm sure that this was not a free option - but RB users got the database auto-populate software update for free anyway. You expect AirNav to maintain the database and I'm sure that they could if they employed a team to do it - are you prepared to pay for this?
So, if you help the VOLUNTARY UNPAID GAS team to update the database, you are not populating the database for AirNav, you are improving a resource that is used by very many aviation enthusiasts around the world, including those who use the SBS-1 which also uses the GAS data.
I hope that this helps you understand the whole database issue.