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Why might a brokerage firm stop offering a particular ETF commission free?
Forbes has an article investigating this. Here are the key parts: On line at the bottom of the list of funds there is an entire screen   of grey-faded micro print which includes this telling disclosure: TD Ameritrade receives remuneration from certain ETFs (exchange-traded     funds) that participate in the commission-free ETF program for     shareholder, administrative and/or other services. In other words, TD Ameritrade is now enforcing a pay-to-play for their   so-called commission-free exchange-traded funds. They are willing to   forego their $6.95 trading commission in favor of remuneration   directly from the ETF vendors. Because Vanguard refuses to pay such   money to custodians, they are no longer being allowed to play. and Joseph Giannone, a TD Ameritrade spokesman, was quoted as saying,   "With any business decision, client needs are paramount, but the   underlying economics of programs can’t be ignored. ... In line with   industry practices, certain providers pay servicing, administrative or   other fees. Vanguard elected not to be a part of the new program." So basically it sounds like Vanguard, and presumably iShares as well, were unwilling to pay TD Ameritrade to continue offering their ETFs commission-free.