So far, the primary country that has developed its own fragmented internet is China. The response from India, the US, and others merely represents a reciprocal retaliation to the CCP's arbitrary bans on foreign internet service companies, just as Canada retaliated to US-imposed aluminum tariffs with its own tariffs.
Until countries begin imposing these types of bans in a non-reciprocal fashion (i.e., targeting countries other than China), there is no reason to believe that the internet will become further fragmented outside of China. Furthermore, the main goal of reciprocal retaliation is to discourage the original activity, so if anything, reciprocal actions by India and the US will prevent further fragmentation of the internet.
Arguing that the US should not engage in these actions is like arguing that Canada should not respond to US-imposed tariffs with its own tariffs on US goods. Failing to reciprocate would lead to more tariffs, not less.
Until countries begin imposing these types of bans in a non-reciprocal fashion (i.e., targeting countries other than China), there is no reason to believe that the internet will become further fragmented outside of China. Furthermore, the main goal of reciprocal retaliation is to discourage the original activity, so if anything, reciprocal actions by India and the US will prevent further fragmentation of the internet.
Arguing that the US should not engage in these actions is like arguing that Canada should not respond to US-imposed tariffs with its own tariffs on US goods. Failing to reciprocate would lead to more tariffs, not less.