Question regarding addon domain

Hi Guys! Just had a small doubt regarding adding a domain to an existing hosting account!

Let's say I have two money sites A.com and B.com
A.com is currently linked to an hosting account. When using the add-on domain option in cpanel to add B.com to the same hosting account, a subdomain is created automatically with the name A.B.com

Now my question is will this subdomain affect my two money sites in any way? Both my money sites won't be linked to each other FYI.

Any answers would be much appreciated.

Don't do this. Keep them separate.

I believe A and B will share the same ip. is better to put them on different accounts.

andrewmp said:

I believe A and B will share the same ip. is better to put them on different accounts.

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true that , both of the domains will share the same IP , anyway if you can afford it move the website to another host , if not try using a CDN

it does not affect your money sites if your link building are whitehats