How much have they had to pay in penalties, and how many significant structural changes have there been? That's the standard to use, not number of lawsuits or even number of verdicts.
Antitrust penalties, more often than not, aren't even as big as the extra profit a company made!
There should be results. Tech giants are too big to fail, as are the big banks and insurers. If we break up the banks and insurers by product offerings, then why not break up big tech?
Each company gets split into 3 smaller firms, each with access to all the IP of the mothership. They get to fight for their customers, and barter over business assets, to figure out who owns what.
I find it so highly ironic that anyone truly believes this would end up better.
They would not fight over customers, in the same way the breakup of AT&T did not result in a fight over customers - only a more complete, nimble, and effective domination of the entire US that lasts to this day.
These companies are hamstrung by their size and internal cultural infighting - you will break them into much more effective units than they can culturally achieve themselves.
The typical trotted out example of Microsoft is an aberration - Microsoft did not believe anything bad would ever happen, was horribly defiant, and refused to prepare. It still bounced back anyway, to a point of serious domination again.
Meanwhile, all of these current tech companies are prepared for this eventuality, as AT&T did.
I'm unconvinced that breaking them up is a good thing or not.
But for me the biggest "for" argument isn't that the broken up companies will compete with each other (that makes no sense because you'd break them up along business lines where they don't compete anyway).
Instead for me it is that it removes cross subsidies both financial (as in "we can give away this loss making application because we make so much money from X) and marketing (our new product Y is inferior to the existing product Z but we can make Y the default in our other apps and then people will just use it).
This removal of cross subsidies does increase competition.
However it's possible to force the removal of cross subsidies by other means (eg, the old "force the user to be able to select the search engine in Internet Explorer" regulation etc).
Yeah, you could kind of see this when Google started making Maps pay its own way, and started charging seriously for Maps API access - suddenly a host of decent alternatives sprang up, because they stopped sucking all of the oxygen out of the market.
Acting on splitting up the monopolies. Making Amazon/Google/Meta into multiple smaller companies. As antitrust fines have now just become the exepences one pay to run a monopoly now.
