I cannot think of any principle that would cause me to object to this.
Blind fealty to general purpose computing here conflicts with the very real world impact on non-crypto consumers. If we're being utilitarian, it seems to me that it would be obvious that this is a good move.
They frankly contribute to society in a way that speculators never will.
If crypto ends up becoming the de facto world currency, then mining groups that are already wealthy purchasing all available stock of GPUs to mine and further enrich themselves is sort of like if 70% of land was owned by wealthy nobles, and they used the profits from their land ownership to purchase all new land-producing/discovering capital and therefore become the owners of all new land coming onto the market. It's like the worst nightmare of those worried about income inequality. And it just so happens to affect retail consumers who just want "land" for other purposes than becoming richer.
So, basically, like REITs? It's funny that graphics card feature sets are what generate moral outrage when a feudal regression happening in real time before our very eyes in regards to the basic necessities of life.
And crypto itself is the biggest hit to general purpose computing outside of the walled garden world of phones. What computing can be done if crypto speculation consumes all available computing power?