Source for the 6 billion ?
Additionally one can not 'destroy' bitcoin by maintaining 51% of the hashrate for a short timespan.
Or they could just easily ban the posession/usage/trading of cryptocurrencies. Would cost them way less.
Additionally it would need a hardware manufacturer to produce all the ASIC's needed to obtain such a big % of the hashrate.
If this businessman were 'intelligent', he wouldn't 'invest' in tons of mining hardware just to NOT MAKE PROFIT with it.
If you own enough ASICS to have a big % of the total hashrate, you earn WAY MORE when simply mining.
Thats not how it works.
ASIC's do only work for ONE algorithm. After 'destroying' bitcoin, the whole hardware would be useless and worth almost nothing anymore.
This doesn't make the attacker richer.. an attacker would effectively throw money away.
Please stop posting misleading information. All of your 'facts' are simply wrong and illogical.