I believe these creatures are nomadic, and they utilize HUGE areas. This is part of why anti-discovery is desired by government. "Protecting" an entire region for a nomadic species would be traumatic to humanity. Many people already live in these areas. An example of such a species would be barren grounds caribou like the Nelchina or Fortymile caribou herds. These are huge areas, very few people live within these areas, and caribou are a hunted species, yet wildlife managers are still confronted with a myriad of challenges managing these herds. If we're talking about a non-game species that is at extremely low population density, it would be a huge, expensive, and intrusive management challenge.
Better just to look the other way, and assist everybody else to look that way, too..........
One of the best examples of sasquatch "home" reports came from the Albert Ostman story. He claimed that the sasquatch family (his word) that held him hostage lived in a several acre area surrounded by steep cliffs and a single, narrow opening that had a spring or small brook and overhanging rock projections under which they built their sleeping nests for protection from rain. The species appears to reproduce like Homo sapiens, so that rearing their few young takes years, which is supported by their species low density and slow growing (or even declining) situation.
Most public lands in North America already have significant access restrictions. It's not like the pre-automobile era when access by horseback allowed reaching even in near impossible corners of the wilderness. Motor vehicle access is limited to established roadways, and even then, government utilizes gates to restrict access for myriad reasons. Even access by foot or horseback requires permits. Access restrictions offer solitude for sasquatches.