95% of tourist visa requests are denied because they know very well the origin of the women who request the visa.
Countries that are part of the VIS system are required to keep the database updated weekly. USA - CANADA - UK - EU + Schenger - AUSTRALIA - NEW ZEALAND.
If an applicant applies in one of these countries and is denied the visa is transcribed in this database so all other countries accurately know the applicant's status.
Thailand has set up a similar security system for foreigners in Thailand.
" Good person in. Bad person out "
In addition, all immigration offices must update cases involving foreigners once a week.
To get married in Thailand the man must request the certificate of free status for marriage from his Embassy.
On this document the Embassy must quantify your economic status required by the Thai authorities to proceed with the registration of the marriage.
At that point you have entered into the tangle of Thai politics that a foreigner who wants to marry a Thai woman must support her until the day of the divorce with the revocation upon expiry of the Non Immigrant Visa O.