Do monopolies of this scale are ever overthrown? MS in desktop OS, Intel in desktop and server chips. IBM is still a monopoly in mainframe market(not sure). It'

Do monopolies of this scale are ever overthrown? MS in desktop OS, Intel in desktop and server chips. IBM is still a monopoly in mainframe market(not sure). It's just that new powerful industry in terms of mobile, internet services, social media have come up. American Tobacco, Bell, Standard Oil and too some extent MSFT are all gone because of govt. actions. FB has already successfully maneuvered industry change to mobile. It bought in its way into mobile apps and communication platforms. So FB won't be replaced by mastodon or Signal, but by an industry level shift which FB misses and can't buy in.