You, my friend, is who does not understand.
You cannot just transfer a social media account between devices, even if you have cookies, an IP in the same range, there are still different session variables which cannot be ported. You must be prepared that it will trigger KYC or any sort of re auth, your best chance, still bad, is using an anti detect with proxies whoch happen to be clean and not seen on the platform previous(good luck with that) and then spray and pray.
The least you have to have is the account and the email and some sort of 2fa and a replacement/refund policy.
It should be expected that re auth will happen, and not be available, or an outright ban.
Any account vendor which does not host his own infrastructure and let you RDP into the accounts, is by definition a scammer or they do not know.
Of course, most of them are destitute resellers who do not know better. And the accounts, let say X accounts, might have been created when the platforms had a bots slinetly welcome policy, as in before Musk, or for reddit, before IPO, and all these "johnDoe123x" are retrospectively looked at, they are pre nuked.