Raspberry Pis area really, really expensive nowadays. I paid over 300 shitfiat for mine (with all the accessories). The positive side is that it only consumes about 2-3 watts.
Computers these days are just as efficient, if not more, and you can do a lot more with a normal computer. For example, the mac mini 2020 uses 6.8W while idle and 39W at max. source and it can sync the whole blockchain overnight, plus it's absolutely silent.
For the Pi 4 they recommend a PSU of 15W source. It's great for tinkering, but it's not any more a great deal for general computing.
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I don't trust Apple.
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Fair enough, you can also have a look at Microsoft's Project Volterra.
It's basically MS's response to Apple's ARM chips.
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