That is true in any market, not just software. There is a large element of regulatory capture that shapes regulation to favour bigger businesses instead of reining them. Software and online services have been particularly bad because there are so many ways to work around regulation. Apple's current malicious compliance with the EU is an egregious one, but most are more subtle (FB persuading regulators to let them take over whatsapp by arguing chat and social media are different markets).

Ideally, IMO, we should aim to prevent monopoly, not just abuse of monopoly (which is what regulators currently do): https://pietersz.co.uk/2009/11/fix-capitalism