We also need to remember about the CCleaner incident that it could have happened to anyone. Therefore switching to another alternate doesn't necessarily mean you'll be safer, unless it isn't connected to the internet for automatic updates/isn't updated. And outdated software can leave you in a less secure boat because of potential vulnerability exploitation if its actively used/installed.
Modern, popular and trusted companies are high-value targets for the sort of attack that happened to CCleaner. A company which provides banking software was attacked twice (once for Petya and I believe once for WannaCry if am correct) to cause a spread of malicious software, so it could have been worse like that. Luckily the CCleaner infection was targeting businesses and was simply collecting intelligence for the start, and it was contained and handled by Avast accordingly and appropriately in a quick time-space.
There is always someone better out there. A team of 100 security specialists can be outsmarted by one single person if that single person is determined and experienced enough, one slip up can lead to a whole crash down of a scenario. It is reality and life... That is what happens in life. You live and learn.
Which is why I still like CCleaner despite what happened. But if they will be advertising Avast everywhere then it's a no-go for me from now on, because while I agree it is a good for business for them, I just don't like seeing that on software I once loved.