Well, I won't make a moral judgement. However, if you concerned about their spending habits, in most states a spouse is still legally liable for the debt the other spouse creates regardless of who's name the assets are in. So while you may be able to stop them from spending that account, if they rack up a credit card liability, you're still likely held liable. There are disadvantages beyond that. It's important to make sure the spouse has at least a springing power of attorney in the event that you're in a coma and they need access to the account to pay your bills for you. Additionally, the account should at least be in POD form or titled in a revocable trust to bypass probate if you pass away.