As for the reasons, here's a follow-up regarding PowerPC™ support from the IOSPIRIT Blog:

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Follow-up regarding PowerPC™ support

I had to omit PPC support in the Remote Buddy 1.17 and Candelair 1.5 releases because I no longer have access to a PowerPC™ machine for testing purposes and nobody came back to me in time in response to my public search for PPC beta testers via the Remote Buddy forum and Twitter.

In the last two weeks since the release of the update, I have received only four emails regarding the lack of PPC support - of which two offered their help (thanks!). While I appreciate these very much, it also shows that interest in continued PPC support is very low - even much lower than I would have expected.

Therefore - and I really didn't make this decision lightheartedly - the discontinuation of PPC support is now permanent. As a service to those few who still use Remote Buddy on a PPC machine, the last release with PPC support remains available for download from the Remote Buddy FAQ. 
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Best regards, 
Felix Schwarz