Making money and being highly available are different goals.
My biggest career horror was realizing how much the medical informatics concepts have been structured around billing and insurance rather than scientific, biomedical requirements.
These are large, highly profitable vertical markets.
The above remark is demonstrably foolish and ignorant.
Can you be highly available without making money?
And btw I've worked in both the industries you cite. It's hard to think of telecomms having amazing uptime when you have to write a restart script for a core security daemon because the sysadmin doesn't know how.
Making money and being highly available often different goals.