Fidelity Go question

First time bogler here. Just learning and getting things ready per the 3-4 ETF strategy. Here I come to find out fidelity Go is just basically the same thing and it has no expense until balance breaks 25k. Then a 3$ a month up to 50k. Above 50k the expense is .35% annually. Any reason I couldn’t use fidelity go until 50k to make it easy with low expense and then when I go over 50k, call and have them turn the Go feature off. Convert it to self managed, keep the same zero expense ETFs and use fidelity baskets to rebalance and add new funds for $5 a month? Seems like an account feature loop hole, so figured I would ask my fellow bogleheads.

Edit- so based on some of the comments here it seems that self managed is a better option than the Roboadvisor. Based on the comments here the business model is clear. They make it free under 25k to get you onboarded and then charge their expense for rebalancing every once in a while and expect to mirror the market just like bogle. Add onto it having the barrier to withdraw being the taxes. Solution is clear. ETFs like Voo and a couple minutes of math every couple months. Thank you all.