Not the OP, but I have had the experience of working on worthwhile products, but in the context of a preponderately meaningless job. Even if a product has some value, you can find your role demeaned by terrible ethical practices, psychopathic bosses, sales-dominated practises insisting on low quality work, institutional insistence on lying to clients, etc etc. The word 'meaningless' may be a bit over-categorical, but I'd consider it defensible to refer to situations where the meaningless/negative aspects overwhelm the positive.
My experience was that this was the case with all commercial jobs I did. Bearing in mind that only the top 10% or so (which by definition we can't all be included in) have a very wide choice of work.