I'll throw that right back at you. I have a Dell (yes a DELL) laptop running that is about the same age as your G3. It can still to this day perform every function it was purchased for in 1999.
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Here is the problem though. Why should I trust a signed certificate? If I go to a website and am prompted by an un-signed certificate, I need to determine if I trust that that web site.
If I go to a web site and their certificate is signed so no prompt but I have just blindly put my trust in the web site and in the nameless CA.
Personally, I don't trust the CA's any more than I trust some random website.