Earlier quoted context omitted.
It's really annoying that people here are talking about "Zero" fee funds as if they were zero-fee funds. As far as I can tell "Zero" means less than 0.05% fees.
No, zero means a 0% expense ratio and no minimums, as listed for the four funds at the top of https://www.fidelity.com/mutual-funds/investing-ideas/index-... . Unlike most other funds, these are captive to Fidelity so if you ever do an ACATS transfer they have to be liquidated.
In taxable it could cause you to have to stay with Fidelity or eat a tax bill.