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I know the role of miners is not only to mine bitcoins but they also play the role of processing transactions on the bitcoin blockchain. But as I emphasized, people continue to mine bitcoin because they still enjoy large profits from mining. But once all the bitcoins are mined, profits will certainly decrease significantly, and maintaining mining machines just to process transactions will not be feasible. Because the cost of mining machines is very expensive, not to mention other additional costs, but if it is as you say then we can use personal computers to process transactions at that time. Then everything is simpler and easier.
Bruh, seriously....
This topic is making my head hurt, we all talk about Bitcoin here and we don't know the basics?
The cost of a mining machine is expensive because it gives you a huge profit!
When the reward goes to zero, then miners live on from fees and if the income is 100$ a day , there will be 100 miners splitting those into 1$ revenue per day and mine with a cheap miner with 4 chips and 4th/s. Bitcoin mining is not a traditional industry, the amount spent of bitcoin minign can go to zero, this doesn't mean suddenly there won't be any miners left, it takes one guy one asic and the chain goes on!
It's expensive now to run gear that will mine you the share of 1 btc because one BTC is worth 70k!
The daily reward is $59,171,021, if the daily reward will be just $59,171 there will simply be 1000x less mining machines!
That's all!
Of course the role of miners may have to only become restricted to fewer tasks of which involves adding blocks of transactions to the Blockchain.
Restricted to...do the same things as they do now?
Do you think that now miners do some magically completely different than just finding blocks?
Who's to say whether the roles of miners will be lesser, if not more?
You have no idea what Bitcoin mining is, right?