Commercial imagery and communication signals are more likely to be susceptible to jamming and spoofing, but not wholly. Such systems are not designed to be resistant to jamming, but they must be flexible enough to avoid natural interference. While not "frequency agile" in the military sense, they are able to shift frequencies and store information if other signals are causing problems. Also, commercial communication satellite systems have to know who is calling in order to know whom to bill, and to be able to distinguish a paying user's signal from a false one; to that extent they are spoof resistant. Of course, however, localized jamming of communications and imagery downloads might be possible if one knows where to jam.

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Black, J. Todd. "Commercial Satellites: Future Threats or Allies?." Naval War College Review. (Winter 1999). [ 2 quotes ]