How many brands use own drivers?

Hello dear Friends. Very interesting question.
How many audio companies are currently presented on the market, which use own developed and manufactured driver units.

Please write bellow:
1. Contrast audio (Ukraine)
2. Voxative (Germany)

I am worried that the next speaker I purchase will have unique to the company drivers.  The most likely accident to a speaker is driver failure due to electronic or physical (child poking a finger) breaking it.  Then, if the speaker is over say 5 years old or the company goes out of business, I would be stuck with a $50,000 pair of coffins instead of speakers.  This is a serious concern of mine.  I currently use speakers which have drivers which are retrofittable if not identical after 25 years on the market.

Does anyone else worry about purchasing speakers that could fail and not be repairable?