In Opera 65.0.3467.62 64-bit on Windows 10, I can't confirm. I can log into amazon.it and amazon.com with Opera's adblocker and tracker blocker turned on no problem. I even installed Ghostery and still can't confirm. No crash.
same version here (65.0.3467.62) the problem seems to happen only with Opera's adblocker and tracker blocker. having Ghostery on or off doesn't change the issues.
actually while looking for the version data i noticed an update available (now i'm on 65.0.3467.69 and will start all tests again)
even weirder this morning i couldn't connect to ANY site at all (as of yesterday no problem with other browsers) until i completely turned off adblocker AND VPN (the in-built one) from settings.
after that i'll try a clean installation and will post the results here.
please do not close this post, please
Edit: updated Opera at the newer version and couldn't reactivate VPN from the address bar (a message said VPN couldn't connect and Opera was working on it) tried to turn it off completely from the Easy Settings bar on the right and then on again and now everything seems ok.
would be nice to understand what happened but, as of now i can't replicate the issue so, i guess, problem solved?