The multi-verse was a rather inspired atheist defense against ubiquitous theological philosophy. These days it is not found to be scientific, and requires assumptions of infinite proportions.
Why would a theory that requires the maximum presumption possible be taken seriously, even by many scientists? Maybe its repeated set of existences infer that everything is reactive happenstance, which works well with the amorality of materialism. Meaninglessness doesn’t care about inhumanity, greed, inequality or the jungle law of Capitalism.