I don't see those service as worth much, if anything.
Automatically enrolling employees in your defined contribution plan.
You've already done this. Value $0
Increasing their plan contributions annually by a percentage you set.
This requires, at most, a form completed once per year. Assuming you are slow and it takes you 12 minutes, that 0.2 hr/year. If you make $50 per hour that's $10.
Allocating their assets appropriately over time, without having to take action
Assuming you invest in Vanguard target date funds, again, this is already done for you so it has $0 value. If you invest in index or other funds instead then perhaps it costs another 3 minutes of your time every year to look up the allocation of the relevant target date fund to see what allocation Vanguard would set for you. So worst case, 3 minutes per year or 0.05 hr valued at $2.50 per year.
So the value of this program might be $12.50 per year.
If the fees are less than that it could be worthwhile.
Alternatively, it seems to be free if your account value is over $50,000. You should probably wait until you have at least that much. If you have less than that you are probably young and should stick with a 100% total stock market allocation.