No. If I agree upon something, I am not being stolen, that's that simple. If you come to my house and take my car without my consent, it's theft. If I agree you take it it's not.
Discussion
What if many people are not aware of how tail emissions / inflation on Monero work?
Like this guy for example
Then it's their responsibility to research before buying it.
If I impulsively buy something at the store and it doesn't work how I thought because I didn't learn about it beforehand that isn't the stores fault. That's not theft.