It is, but it will also kill your site if done the wrong way. If I can give you some advice, never ever buy links through so-called PBN vendors. They are a prime target of Google and easy to catch. Once they identify the sites sharing the same DNS, they will know that your site is likely a PBN as well. If you're gonna do this, you'll have to pick up domains through dom-cop or some other reseller, run pen checks, mask your registrar, buy separate hosting and run cloudflare + bot blocks on some of them. Never use the same host or registrar twice for the same moneysite, unless you mask it with CF (and never use the same CF account to mask more than one site).