I don’t think they do, honestly. Being rich does not necessarily mean being smart
And those who pay for not being brought up on the lists of most rich, probably don’t use tech themselves
Their wealth comes from stocks, bonds and land, not an account that can be hacked. Their safety against kidnapping for ransom comes from being pals with most of politicians and/or having clout in the right circles to help any politician that will ping high enough to be allowed to get an appointment
https://en.wikipedia.org/wiki/Ahimsa_in_Jainism#Ascetic_practices_for_adherence_to_Ahimsa
Apparently, some already try since quite some time now