Yes, I just installed it an hour ago on a Mac Mini G4 I had laying around...

Even the bootable "live"version does it.

It is a two hour limit. Very noticeable, like a 2 second lag on the mouse.

To register, you must run a program in the install, that ties the registration to your unique hardware/id signature.

Pretty snappy before the two hour limit on 10 year old hardware. Works great on 1280x1024 display, not so much luck on the 1080p monitor here.

to me this seems an odd way to get people to purchase a license, I wonder if it actually works to any great extent..

I wonder why this is commercial; no more than a handful of people will install/use this powerpc version will they?

In the Amiga scene, people expect to get paid for their work.

Ok, that is their choice of course, but this is not about making money (from the numbers I found they cannot be making much of that) or they would be working on something else?

Have you ever seen paid Amiga demos? :>

Demos are an outgrowth of the software-piracy scene. Most developers of non-grey-market software expected to be compensated for their work.

In fact there was one case where Microsoft used open source to destroy an entire software niche on Amiga: they acquihired the developer of Bars & Pipes Professional and got him to open source it, destroying the market for Amiga sequencing software. When you consider that musicians have kept their old Atari STs going until well into the 2000s, that market was bigger than you might have supposed.