If you don't make use of a level fresh accounts to buy RS3 Gold, you won't be exiled. Except if you bought illegal osrs gold that was stolen from a different account.
as insofar as I know there are legitimate websites that sell safe OSRs gold that were sourced by Green Dragon Kill, there are also professional gold farming studios in Asia countries, and they may not have the lowest prices but gold is security to purchase. Jagex isn't going to restrict the sale of Cheap RS Gold. You can check out some of the well-known Osrs gold stores like RSorder.com, rsgoldfast.com, p2pah.com They actually do business.