A rare bid to break up Alphabet Inc.’s Google is one of the options being considered by the Justice Department after a landmark court ruling found that the company monopolized the online search market, according to people with knowledge of the deliberations.
They already tried, in the late 90's, and a district court ordered a break-up. It was appealed endlessly, and the DOJ reached a disastrous settlement that gave them immunity from anti-trust prosecution in perpetuity. The current Supreme Court would probably use this as a precedent to protect other software monopolies, if it comes down to it.