Hi there @NeyfunB, I don't believe we have any bloatware installed on our Google Pixel devices so you get that stock Android experience. However, I'd recommend heading into your closest Optus store to inspect the device just to double-check.
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@NeyfunBOptus based on feedback, phones and dongles I have bought that were from Optus (aka branded in some way Optus) then they all have the following:
1) Startup logo is usually Optus for phones
2) There is Optus branding in the menu for dongles.
3) Some features have been removed or disabled from Optus branded devices, but the original have them.
4) No additional apps installed that I have seen or read about in the last say 5 years.
5) If it's optus branded then updates need to be supplied by Optus, so if optus are slow or stop supporting the device then you will not get updates. You can always try to root the phone and hack the original OEM firmware on the device if it can be found, but this can be tricky.
So in summary, no bloatware but branding and feature changes are made.