"Pegasus" is not one hacking entity like most articles make it out to be. Its
1) A bunch of services that download data, given root access to a phone
2) a bank of 0-days, we don't know how deep.
For all we know, there are times when "Pegasus" doesn't work for hours, days, weeks, until the 0-day is rotated. We do know from some leaks that they have a mix of non-click and click exploits, and also support all different kinds of phone OS.
Their hacking abilities are definitely overstated, for all we know, for smooth continuous customer support, they could be buying 100% of their 0-days, and not finding any themselves. A 0-click 0-day for iPhones is worth about $2,000,000[1], a company with contracts like NSO can afford a lot of those. IMO the media portraying them as super-hackers is pure hype. Its a bunch of crooked business people who figured out how to extract money out of countries
[1] https://arstechnica.com/information-technology/2019/01/zerod...