We often assume that it is normal that there are small print traps for “silly” or “lazy” customers. It is not.
I’ve been convinced in a shop that I am switching to a better, straight forward deal with the Orange phone company. They asked me if I call abroad from my mobile phone regularly and I said “no” (as I am using cheap Just Dial from home for this). Then my daughter had to go to a hospital, my mother abroad was worried and I ended up calling and messaging her a lot. The cost was outrageous. So the Orange did well out of me. I am wondering how many other people in trouble they used in the same way.
My daughter suggested to me to switch to Giffgaff and I am pretty happy so far as it is cheap all round and absolutely transparent. After a month of use they recommended me a better deal in a polite email, not like T Mobile which had somebody pushy and annoying calling me.
So, hiding behind small print is dishonest. You may earn accidental money but will loose loyal long term customers.