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If anything, ads steal from YOU. They take your time and attempt to get you to part with your money.
You're not obligated to support a business model based on theft, if you want to consider it that. You're not obligated to support any business model.
If it's allowed, then go for it. They can always switch to another business model.
Copying a thing or accessing a platform = the previous owner can still use or sell it.
Even if you consider it unethical access, the comparison to stealing really misses the mark.
It would be amorale if these services were not exploiting everyone they can, including the creators.
The better analogy would be, is it okay to walk out on a barber who is spying on your phone, coughing in your face, and won't stop trying to convince you to buy his buddies shampoo or vote for their political party.
I know this always triggers a hard-coded response based on regex, but the comparison doesn't rely on the specifics of stealing, so it's not a valid criticism. The logic is: people offer things in exchange for a price. You can take the things in exchange for the price, or you can leave the things. You shouldn't take the things without paying the price.