Why do market makers sometimes quote absurd bid and ask prices rather than remove their quotes?

First, MM's are bound to provide quotes within specific parameters by contract. ONE of those parameters is time (95% of the time, i.e.).

Second, this could be just a bet (maybe someone sells market - it DOES happen, MM's often keep far away orders for cases like that) or.... a software issue (not able to handle a 0 price "properly" and thus providing a quote for the smallest possible price) - on the MM side.

These "absurd bid and ask prices" are called "stub quotes".

A stub quote is an offer to buy or sell a stock at a price so far away from the prevailing market that it is not intended to be executed, such as an order to buy at a penny or an offer to sell at $100,000. A market maker may enter stub quotes to nominally comply with its obligation to maintain a two-sided quotation at those times when it does not wish to actively provide liquidity.

(source)

In the USA, market makers are not allowed to enter stub quotes on Regulation NMS stocks during regular trading hours. This rule was introduced after the 2010 flash crash. The relevant SEC press release: SEC Approves New Rules Prohibiting Market Maker Stub Quotes.

However, FSUMF is an over-the-counter stock; it is not an exchange-traded stock covered by Regulation NMS. Therefore, the regulations described above do not apply, so market makers are free to enter stub quotes for this stock.