This has already been mentioned, but I think it's worth repeating.

A lot of software authors are struggling to make a living without having to resort to putting adware into their installers. If it were me, I would feel it was a slap in the face to go and wrap my work with such and take the money (saying you can buy a premium subscription if you want to disable it).

Personally I think it is also a problem that this is essentially moving their advertisement from the web, where you at least have some level of control, and down to an executable running on your system (apparently even requiring admin rights).

Here are some further links on the subject:
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