I can't be the only one thinking the existence of such big corporations is not good. Certainly, a lack of startups that are not making it is a negative sign. But the tech industry also consolidating into several massive green bubbles is also a negative.
Also, big tech companies tend not to produce good software, so they aren't a positive sign for the software industry. Rather they started out with a piece of valuable software that they somehow entrenched, monopolized and could then rent-seek on, but tend to lose the ability to create good innovative software. Private small to mid-size companies usually are where the truly innovative and good software comes from.
When I think of advanced innovative software over the past few decades that I used or impressed me. A lot of it did come out of the EU or Canada. Crytek and Cryengine. TheFoundry VisionMongers. ChaosGroup VRay. Ableton Live. Unity. BitSquid Stingray. JetBrains. Affinity Photo and Affinity Design. Maxon C4D. Blender Foundation is the EU. Alias Maya came from Toronto. Eyeon Fusion also came from Toronto. Cebas FinalRender is Canadian. Softimage was in Montreal. SifdeFX Houdini.
Most really advanced native applications dealing with graphics or audio I can think of did not come out of the USA. Rather, a USA company bought them, or development moved to the USA, at some point, which generally marked a downturn in the software.
I've actually been dismayed at a lot of US tech because US seems good at hustling to build some web services that could produce massive ROI, but culturally it's tech scene and all the corporate tech culture really seems incapable of producing novel, innovative, advanced native applications.