We've been living through the good parts. It is only going to get more "normal".
Thinking this has happened for a while. What happened to all the disk defraggers when windows added one built in? I think maybe they licensed it... it it sure didn’t help the market.
The disk defragmenter included with Windows was somewhat lousy, but it gave OS hooks needed for other tools to do live defragmentations. The problem is that in both the consumer and enterprise spaces, underlying disk storage maintenance was just a checkbox - you had to sell any specialized version as part of a performance and antivirus suite.
Citrix also did something similar with Windows Terminal Services. Before terminal services, Citrix had to maintain a Windows NT source license just to be able to manage all of the required OS hooks.
Microsoft used Spyglass Mosaic as the foundation for Internet Explorer 1, and Direct3D was from an acquired company called RenderMorphics.
Apple of course does something similar - see their acquisitions of Siri, Shazam, Testflight and Workflow. They are stories around Steve Jobs trying to acquire DropBox pretty early in its history as well.
That said, I can’t see a world where if Dropbox was a startup today, that they wouldn’t either get acquired, or cloned as a good enough native feature, putting them out of business, which is ultimately your point.
Like iCloud Drive?
Any manufacturer who sells exclusively (or even primarily?) on Amazon.com (think Ring) is potentially an acquisition target from Amazon.com
Personally, I don't have any solution but it gets in the way of my dream: I'd prefer the mobile platforms (iOS, Android) require that independent software vendors submit human and machine readable source code and build instructions and have the app store build and serve binaries with its own keys (think F-droid). Probably opt-in to begin with but eventually, I'd like this to be a requirement to be on the app stores.
These are uncharted waters, if you ask me.
It's also why Linux exists.
As tech companies continue the hard turn from value proposition to value extraction, it's getting easier to say "no thanks" and switch to open systems shared among the public.