By the way, notice Yubikey did not really release any new series/models and jacked up their price in just a few years. About 50% in 4 years.
The large adoption of those devices and standards did not lower the price.
They probably just banked on the enterprise market where every CISO was pressured to tick the hardware/2FA checkbox. And is then gonna allow to use the Microsoft/Google "software" one because it is hard to manage otherwise.
I think there's a bunch of factors to why yubi have upped their prices - not least, waiting for competition in their form factor & not seeing any emerge (token2 & nitrokey are much bulkier) probably gave them some confidence in the uniqueness of their product offering.
It's also become a much more niche product as software based (and/or primary-device-hardware-based) solutions have evolved & improved. & niche costs more.
All that said I'm really not sure why they've been so quiet on new series releases.