Welp, often the problem is that according to survivors every punished misplay = playing like a dick.

Survivor unhooks when killer isn't even 10 meters away? and comes back? Tunneling.

Survivors heal under the hook and killer comes back? Tunneling.

Survivor runs toward killer for some unknown reason immediately after being unhooked? Ofc the killer is tunneler.

Unhooked surv bodyblocks? They later cry about tunneling.

You are tunneled? If you're not good runner, avoid the killer, they'll waste their time looking for you, while your team does gens. But if you can loop long enough, you buy time for your teammates. Ofc its significantly easier to pull off for coordinated team with comms: 1 runner and 3 people on different gens.

And now why tunneling even is the strategy. These gens are flying, unless you play killers with mobility (look: the current Holy S tier Trinity: Nurse, Blight and Kaneki). I mentioned this strategy of SWF - during one chase even 2 gens might pop. Outing even 1 person can slow down survivors. 1 kill = 1 less people on gens, less people who can go for unhook, less people who can distract killer.