SCOTUS broke up the Standard Oil monopoly in 1912. The CEO ruefully old his disbanding board, “Well boys, it’s just one damn thing after another.” One year later, the broke-up pieces’ stock prices had doubled. The Ma Bell breakup was similar, with most of the broke-up bits re-amalgamating later.
My conclusion: MAGAF (Microsoft, Apple, Google, Amazon, Facebook) may be somewhat disassembled temporarily, but they won’t lose much money in the process.