Bearing in mind that the ICO's remit is to ensure compliance rather than dole out punishment, this seems broadly reasonable. I'm quite confident that HelloFresh understand that a) they're being watched and b) the ICO won't be nearly so lenient if HelloFresh come to their attention again. I know that people get very angry about spam, but a huge fine that would "guarantee deterrence" would rightly be challenged in court as disproportionate.
https://ico.org.uk/media/action-weve-taken/mpns/4027967/hell...