It is only worth it though if the shitcoin is worth more than the cost of electricity used to generate it. At the moment and for many miners, that just won’t be the case.
Most shit pins probably have few miners, and are pretty susceptible to market manipulation. I large influx of miners across the market could dramatically change the price.
Also, many miners are already using software that automatically changes their hardware to target whatever coin has the most profitability. It’s expected that this will continue just without ETH