Personal Comments
Gaya sold a bespoke version of one of my nearby airports - Block Island, RI USA - KBID before a stripped-down version was included in USA World Update 2. It’s the same product - just missing goodies like static parked traffic, people avatars, moving ramp vehicles etc.
Gaya’s version is no longer sold following USA WU 2 - even though the page makes you think it does (leads to Orbx but throws a 404).
https://www.gaya-simulations.com/products/block-island
That was a rare instance of a commercial payware having stayed long enough on the market to garner some stand-alone sales before being contracted for exclusivity. So the pattern is clear in terms of how the assets are acquired. The support is not abandoned (users must open an MS Zendesk, if it’s actionable by the manufacturer it gets routed to them), it’s just the creators have probably surrendered any further development on the product for however long MSFS lasts.