Oh my - someone patronizing me that does not even know how the NBBO works. Let me take you to school on this. Brokers do not set the bid/ask price - that comes from the consolidate quote which is the best National Bid/Offer across all the ECNs. The bid/ask quote are ubiquitous among all brokers.
ETFs with less liquidity have wider spreads - this is not your brokers fault, they simply pass through the NBBO.
Saving $2,500 on commissions while getting a good rate on the cash sweep is a great deal. Fidelity took Barron's #1 spot in 2016/2017. Their 606 reports look good - no signs of blatant payment for order flow like some brokers.
I don't trade commission free ETFs or options. When you use a number of brokers like I do it gives you the best of all worlds since they all seem to have a thing or two they do better than their competition. Getting 10,000 shares filled in a split second directly on the ECN of choice with free L2 is nice, not to mention the first 500 free trades is a killer deal.