Is it safe to place the same bio link on multiple accounts?

Is it safe to place the same bio link on multiple accounts? For example, place the same link on 10 accounts, is it safe? I heard someone said that this is not safe. If there is a rule about this, can someone send me a link to that rule?

i have the same link for 18 accounts. i think when you put the link wait a couple days on each account and you should be fine