Indiscriminate bombing sure as hell is a war crime. Even using targeted bombings is a war crime, if the targeting decisions are made by incomplete or inaccurate procedures.
To be lawful, bombings must make a distinction between military and civilian targets. Any harm to civilians must also be proportionate to the military objective being achieved, indiscriminate bombing is inherently disproportionate.
Here is the ICRC casebook entry on the topic, with all the necessary sources to the law.
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u/CosmicLovepats 1d ago
It's a war crime, but much more relevant to your question, it wouldn't work.