Maybe do a trace with wireshark and compare the connection attempts?
Most website blocks are done on a dns level, maybe vivaldi doesn't accept the "wrong" dns replies, uses DNS-over-HTTPS or doesn't query any affected dns servers.
Maybe because many streaming services have locked their 4k content behind some specific apps and platforms and offer lower resolutions on general desktop PCs.
This graphic shows that the platform is designed with full virtualization in mind. You can see that the VM on the right has its own kernel (unlike for example docker containers).
There are some legitimate attacks on MFA, like stealing cookies. But in most cases, MFA is solid and attackers target the humans behind it (phishing, scamming, social engineering).
Not really a MFA bypass, but rather some impressive social engineering:
The attacker leverages AI-generated deepfakes to create a synthetic identity complete with a forged government document (e.g., passport) and a facial recognition bypass video.
They use this identity to gain access to the account, if I understood it right.
For a start, try hosting something in your own home. A raspberry or an older PC or laptop should be enough.
My first projects were a print server (so I can print via wifi) and a file server. Try to find something that is useful for you.
Only start hosting on the internet when you've learned the basics and have more experience.