You do not understand me correctly, these accounts of friends do not concern me in any way. These are strangers who cannot perform bounty assignments because they are blocked on the site. According to them.
Well... It might be that the accounts of your friends do not concern you in any way, however, hilariousandco found a copy/paste post made by your account... So it'll probably be banned within the next couple of hours to... The forum admins are not lenient when it comes to plagiarism... Sure, in some countries plagiarism might be normal, but in other's it's considered a serious offence (you can actually get kicked from your job/education or even go to jail for plagiarism).
In general, does Vietnam have any restrictions on the site, on the part of the site, or perhaps by the country?
There are 2 restrictions:
1) Points of evil... If an ip is associated with (for example) spammers, points of evil are attached to the ip(range???). If you want to create a new account from a device with an ip that has units of evil, you'll have to pay a small fee in order to activate your account
2) bitcointalk is using cloudflare... If your ip is flagged by cloudflare, you'll be forced to solve a captcha before entering the forum