Yes. The only area’s you’re expected to buy the mouldy park wood is at drive in/front country campgrounds.

Good like finding any decent amount of dead wood around those sites though.  Paddling the shorelines and collecting drift wood will be your best bet.

I recommend adhering to the LNT guidelines "If more substantial firewood is needed, it should be limited to dead-fallen trees located far beyond the sight of the campsite, privy or shoreline. Ragged, saw-amputated dead trees are definitely not part of the natural landscape!"

When it comes to drift-wood along the shores, I believe it's preferable to remove whole smaller pieces rather than amputating sections and leaving raw saw cuts visible from the water.