I think this model breaks down for two reasons

1. The capital expenditure for acquiring the miners and installing the solar panels makes the pay back period very long.
2. Hash rate grows and price stagnates. Thus the difficulty adjustment restricts your expected sat revenues.

Solar and miners haven’t hit economies of scale pricing meaning only the affluent are people able to afford to do both.

Until that happens growth will always be limited thus this company business model breaks down.

Or bitcoin rips and it is the tide that lifts all boats