There's a line of spices that I'm interested in at the supermarket that doesn't explicitly say it's gluten free. It lists a few things I recognize that seem ok like salt and a few spices but then just lists "spices". I don't know why they listed some and then lumped everything else into that broad category. Do you think there's anything to worry about in there?
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IMO, Don't buy spices that have more than one ingredient.
You want a rub, make it yourself.
Spices that are premixed are almost universally crap -- left over, old spices they mix together to bleed another nickel out of the consumer.
Also, Spices with "salt" as an ingredient (assuming it's not salt) are always crap. It's cheap crappy salt, they always over salt it. I'd rather add my own salt.
Personally, I'd stay away on principal, not because of gluten.
If the vendor isn't telling anyone what it's spices are, then how can anyone in this community advise you whether these unknown spices contain gluten? Try looking at the package to see if there's a website or an email address you can use to communicate with the distributor/vendor to get an answer to your question.
I would think that is safe, since gluten-containing things never really contribute to flavor, so they wouldn't be labeled as "spices".
And even if there was a small amount, considering how little anyone uses a particular spice at a time, there wouldn't be enough for a reaction.