Or not. Nothing apple has done is illegal. According to this
https://www.cloudwards.net/search-engine-statistics/ 57% is the searches is mobile. Given googles popularity changing the defaults in iOS would likely have no effect.
As I said above, specifying the default would likely have little impact. You may argue little is better than none, but as long as what apple and google are doing is legit, why should they change to appease some internet posters?
Unless Apple goes into the search engine business, it’s my contention that offering a default option would have people choosing google anyway. Those that already want the default would be changing it to what they want.