At this point the bitcoin blockchain difficulty is so high its probably not worth it for home miners to even try, probably better mining some other coin. Thats one of the critiques against a proof of work blockchain, as price goes up, difficulty goes up, rewards go down, so the only entities which can hash to the level needed are these huge mining centers. You need ASIC miners, which are patented and with very few manufacturers. It slowly evolves into something centralized in that sense.
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