It is ok for blizzard buying new account or other site?

Hi all!
Just want a information: for Blizzard it’s legit buyng other account (like smurf or just for new fresh start) on sites like G2a or IGVault? i’m see that there are a lot of account on sale, and since i already have one, if i’m buy another one on these sites it’s ok? And in case i’ll have problem (like lost data or steal account), i’ll have in future any kind of assistance from theme (blizzard)? or if i want to play with another one, i have to buy the game again?

Buying an account is against the TOS.

G2A is known for selling keys bought with stolen credit cards.

If I were you I’d just buy a key from the official store.