First part, possibly, second part, no. Even if Thailand would still be like Laos and Cambodia if it wasn't for international tourism, that doesn't mean that the Thais owe foreign people anything, or that foreign people can say that their money helping Thailand gives them any claim to it.
People who paid to visit Thailand paid to visit Thailand. That's it. Once the transaction is finished, Thailand has their money and the foreigner has their experience. No one owes anyone anything following that.