I am not "morally" against it per se, but I do think it's usually insane and irresponsible.

First of all, I highly doubt that these women just couldn't find a nice man to have kids with. Especially when apparently money is not an issue. I'm biased because my own mother is/was objectively NOT good looking and she found my stepfather who is basically the most self-sacrificial saintly guy you've ever seen. Even if you don't want the commitment, it's better to just have a child and divorce the man later as at least this way the man still has a chance to be an involved father.

Second of all, intentionally depriving a child of a two-parent household is cruel as two-parent households are known to produce the best outcomes in kids. When 80 yo celebrities have kids it's seen as insane because they're about to drop dead. Having a kid with a sperm donor is arguably similar or worse because at least with those celebrities the kid can watch their old movies to relate to them and feel proud. With a sperm donor there's nothing.

Thirdly, possibly having multiple half-siblings you don't know about is just weird and dangerous.

Again, I don't personally care if people do this but I am convinced that if lots of men became single parents via surrogate it would be seen as creepy and weird. But we're not allowed to question women's reproductive choices I guess, no matter how irresponsible.