It is true that your MuchBetter account is not going to stay open forever if you forget about it, but you are not in any rush to keep it active.
If your MuchBetter account remains inactive for 12 months, MuchBetter will reach out to you and remind you to check up on it. If you still do nothing, then MuchBetter will start charging a fee if your account has any funds in it.
MuchBetter can terminate your account if you haven't been active in 60 months.