Why don't mitochondria have junk DNA?

Selection for fast replication? That's the usual idea for bacteria, but
do mitochondria have to replicate that often compared to the nucleus of
the same cell? That would depend on the lifetime of a mitochondrion and
its standing population in the cell. I'll have to look that up.

If not that, then what?

There are mitochondria with junk. In fact the control region has been
duplicated several times in different groups of birds, and one of the
copies is clearly non-functional. So it does happen. But why so rarely?

.

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