It would have had blackouts if it didn't build all those bitcoin mines. The bitcoin mines encouraged power infrastructure development, and they can just be taken offline when high heat causes power demand spikes for air conditioning.
In theory supply and demand still exists in Texas, and Bitcoin miners do demand a lot of energy. Assuming that energy companies are including Bitcoin miners in their demand projections (I don't see why they wouldn't?) then the default assumption is that just based on the market forces at play, capacity should have been built with Bitcoin miner demand included.
The simple fact of the matter is Texas does not have sufficient electrical generation capacity to satiate its demands, especially given the record spate of hot days (it's been daily highs above 100F in Austin for two months). There's no need to add extra sources of demand to encourage new supply.