It should be the way of investing Bitcoin. Everyone should hold their own Bitcoin directly and not from all of those other way of investing indirectly to Bitcoin. But that's true, they're very beginner friendly and they're trusted just as how people trust them on investing that way. And as everyone is encouraged to buy and hold their own Bitcoin, if you want it to be secured then choose a hardware wallet that where you can hold it to. But there is nothing wrong if an investor wants to invest also into those ETFs.
Bitcoin mining is the basic way you can grow your bitcoin .The primary purpose of mining is to allow Bitcoin nodes to reach a secure, tamper-resistant consensus. Mining is also the mechanism used to introduce bitcoins into the system. Miners are paid transaction fees as well as a subsidy of newly created coins, called block rewards.
So Bitcoin is very unique and vital for income.