Also ask around friends and family - in my experience lots of folks keep a couple old machines they no longer need because they don’t want to throw them out (or pay extra to throw them out) and once folks know you as the old computer guy you might be surprised at how many people message you to be like ‘you want this?’ before they throw something out.
And if that doesn’t work, there’s always free groups like Buy Nothing and Everything is Free online, usually local to your town or city.
The one near me took a couple years to really fade. It’s mostly covered by Ivy that grew over it, but anyone could cut it down. Considering the somewhat progressive message I’m surprised nobody did so the day it went up.