I'm looking for a word that describes a situation where not making (or refusing to make) a decision is equivalent to choosing one of the options. I considered "ultimatum", but it seems overly aggressive for my use case. I looked over the synonyms for "ultimatum", but they were all worse.
A compound word or short phrase could be acceptable.
An example situation that may be described by this word would be the decision between doing something (that you aren't currently doing) versus not doing that thing. In such a case, not making a decision is practically equivalent to choosing to not do that thing.