I'm in Thailand now and I'll explain to you how it happens for me and all my friends. There is simply no lease agreement! You rent an apartment in most cases without even seeing the owner of the apartment. Usually this is done by brokers and rent out the apartments of compatriots and they do not even have a power of attorney. But in 99.9% of cases there is no fraud - and if you pay on time, there are no problems either. This is a contrived problem.
RE: Advice on being a Landlord in Thailand - Beware 10 Year Jail Penalties!