I bet he didn't refuse to answer Mueller's questions

Bannon spent a total of some 20 hours [over multiple days this week] in conversations with the team led by Mueller.

[...]

After a more than four-week stalemate, Bannon also returned to Capitol Hill Thursday to resume his interview with the House Intelligence Committee that was halted when he earlier refused to answer key questions in the Russia probe.

He left today after four hours, answering little more than the two dozen questions that the White House had negotiated with the House’s lead counsel.

[...]

The committee had issued a subpoena in their initial Jan. 16 interview when Bannon would not address issues that arose during his time on the Trump transition team, in the White House and after he left his top position there. The subpoena deadline was postponed three times as House lawyers negotiated with the White House over what Bannon would be willing to discuss without the White House invoking executive privilege to bar the testimony.

Lawmakers indicated Thursday that his continued non-cooperation might require the committee to take the next step and consider beginning the process of holding Bannon in contempt of Congress.

“The only questions he would answer were questions that had been scripted, literally scripted for him by the White House,” Rep. Adam Schiff, the ranking Democrat on the committee, told reporters. “Whenever we sought to probe anything beyond the four corners of the specific wording of the question, he refused to answer. That’s not how executive privilege works.”

  NBC

They're not going to hold him in contempt.

...but hey, do what you want...you will anyway.