Oh, I didn't know Texas is one of the states that taxes cloud hosting.
But I don't think this applies to your situation, since
the guidance states that "Settling of electronic payment transactions by certain entities" are not taxable. I couldn't find anything specifically declaring that crypto mining services are taxable, so you could default to not levying tax as long as your accountant agrees.
There's probably a way you could make it work, such as taking wallet addresses from customers and having the pool mine directly to their wallet.
So is this sub-corporation issuing securities?
I don't think so, since it would be an S-corporation or LLC with just one shareholder, and the shares are not being publicly sold. The sub-corp wouldn't even have to issue more shares for more investment. The customer could simply write a check to the sub-corp, which I'll then use to buy more equipment. No stock or securities transactions involved here since they already own 100%.
But like I said, I'll talk to an attorney. I don't care what the structure is, as long as the customer can take the depreciation (since I have no use for it) and the parent corp is the exclusive hosting provider.