The act of pointing out whataboutism are usually done so the hypocritical side can take refuge and refute any discussion. This often happen because hypocrisy is real - otherwise it would be easy to refute the equivalence instead.
It does sometimes gets you somewhere. Hypocrisy implies the (often moral) concern over the accusation is not a genuine one, that the accusers are merely criticising to advance their agenda. If an agenda is involved, then whatever the accuser says should be taken with some grain of salt.
In case of Namecheap: it’s 100% complete bullshit when they say they hate war & invasions, and people are calling them out on that. Instead, they should say “we prefer when US invades, because we hate Russia” which would be much closer to the truth.
See how two can play at this absolutely pointless game of offering pithy remarks without any argument behind them?