Solar isn't free.
Tell you what I'll sell you all the free solar you want.
You pay me $10,000 per KW upfront and I will provide you lifetime "free" power.
How many "free" KW you want to buy right now?
waste of time thinking that solar are a better investment, you pay basically electricity in advance
what is matter is cheap electricity but also the initial investment, you cna invest big in miners and solar but you need to selle evrything later, fi you want a fast and big profit, with little risk
Solar is so long term it's practically more of a investment on the house it's on. It could be 10 years before you get it back. And if your using a lot of BTC miners the cost of it can be huge.
The person that wins every time is the one who finds cheap electricity. Cheap electricity always will win out over solar/wind/ etc.
Well the efficiency of the solar/wind plants is very questionable. Solar energy is good if you live in a very sunny area but even then people use it for water heater for example, definitely not to power up Bitcoin miners.
This is not a dependable way of producing electricity, you cannot be 100% sure that you will have it tomorrow. Like that it's also completely unsuitable for mining where first thing to be profitable, you have to have your miners on 24/7.