Dave Lee did a video - he bought an old Mac Pro for $1,300 - it has a six-core Xeon (2.5 Ghz I think), dual video cards and 32 GB of RAM. I think that it only had 256 GB of SSD. That seems like a lot of money but at least you don't have to worry about the keyboard, speakers, throttling, touch bar, and video issues.
Whilst true the Mac Pro hasn't had nearly the amount of issues of the MBP, it has had GPU failures and power supply whining issues.
Specifically I am only talking about the 6.1 nMP, as Apple still sells it for a ridiculous price considering its age.
I have found some old PowerMacs on Craigslist for free - you just have to pick them up. I may give mine away similarly. My guess is that they were used at Biotech companies given the location.
That's a good deal. I've never found a free Mac, but I have paid (very little) for some PowerPCs. iMacs and iBooks mostly.
I thought I could run Linux instead of the mac interface. For two years I used a dell running Linus Ubuntu, until I just got tired of it. Linux is generally about 5-7 behind the times, and its just dull. Also, I can do things faster in the mac. You do need to know that buying and 2013-2015 will make you susceptible to the Kext shutdown and might have to deal with that. But other than that, my 2014(late 2013 build) has all the ports, and at 2.6 i7 is a screamer for everything I do. I would not get a current model if this breaks.
"Dull" and doing things faster in one OS versus another is all subjective, but Linux being 5-7 (I assume you wanted to write years?) behind everything else, is insanely wrong.
With many things, Linux has been first to market. Spaces as we know it on macOS originated as Workspaces on CDE and has been in most major Linux DEs.
Logical volume grouping like offered by Core Storage started as a Linux technology.
Basically everything good about APFS comes from btrfs.
The idea of a centralised app repository, app store and package manager is something Linux does incredibly well and no other desktop platform can compete with. With homebrew on the Mac it's about the same, but it's a Linux first.
Many of the advantages that was brought forth when Apple rewrote the display manager with Metal was inspired by Wayland on Linux. Now Apple made a stable product first, but the ideas originated in Linux.
Much of the security used by macOS originates from Linux including KAISER.
But actually, about the subjective point that it is "dull". How can it be? When everything can be just the way you want it, and there are so many desktop environments to choose from? If you find it dull, swap it out