For anyone else not sure what they're looking at...

Tree Spiking

Tree spiking can be an extremely effective method of deterring timber sales, and seems to be growing more and more popular. Mill operators are quite wary of accepting timber that may be contaminated with hidden metal objects, — saws are expensive, and a “spiked” log can literally bring operations to a screeching halt, at least until a new blade can be put into service. The Forest Service and timber industry are very nervous about spiking — when they or the media raise the subject of monkeywrenching, this is the form most commonly discussed. Agency and industry officials are loath, however, to raise the subject. Indeed, the Forest Service (FS) often fails to publicize incidents of spiking, on the theory that the less the practice is publicized, the less likely it is to spread. When the Freddies (FS officials) do publicly acknowledge that a spiking has occurred, they often make a considerable effort to find the perpetrators, even to the point of offering substantial cash rewards. (No modern-day tree spiker has been caught, however.)

Don't forget the supply chain and logistical support required to keep people able to..lets call it "Living their best lives"..

Lets just say that when people are going to be "Living their best lives" in the woods, often for weeks and months at a time, they don't have time to work for money, they don't have ready access to grocery stores or free stores. They need resources in terms of food, camping supplies, medical supply, boots, rain gear, and recreation and mental health. They also need rotation in that you really don't want people "Living their best lives" indefinitely, you're friends need time away from the work. No matter what they claim, they need time NOT "Living their best lives" to be most effective at "Living their best lives".

This means you need a multiple crews of 3-4 individuals that can rotate through 1-3 week intervals of "Living their best lives". Don't try and sustain campaigns "just for the sake of it". Most of the work of "Living their best lives" isn't actually out there in the woods "Living their best lives", its the support network required to those small groups sustained.

There is a great book about "Living their best lives" called The Last Stand, which goes into some loose detail about the timber wars of the 1980's. It doesn't cover the gory bits, but if you got a chance to visit the Emerald Triangle in the late 90's, some of this work was still ongoing (even though it never made it to the news), and many of the surviving old timers were still around to be learned from.

Often a banner that says trees are spiked is already enough of a deterrent! Even easier!

For a moment, I wondered if it was a method to eliminate vampire trees.

The real explanation is actually much better.

Some trees don't survive that tho

Or, how to commit attempted murder on a logger

they often make a considerable effort to find the perpetrators

I got logger family. If you want to protest logging, there are ways to do it that doesn't kill loggers. Spiking can kill loggers.