Singapore makes regulations first before crypto or Bitcoin begins to be used as a means of payment for transactions for goods or services, they care about the friendliness of developing technology, so it is necessary to make clear regulations as a legal umbrella, both to maintain economic growth and early detect money laundering caused by transactions involving crypto.
I do not agree, that this country is a place to hide regulatory obstacles to legal umbrellas in other countries, because they also make special rules governing this issue, which distinguishes Singapore from other countries only in terms of "regulatory certainty" or guarantees for industry players and consumers. also guaranteed to know information about companies that can be trusted.
Singapore is also a country that has a huge income for every native and immigrant, allowing bitcoin to grow rapidly there, and it is possible to achieve status as a Bitcoin hub and become bigger like El Salvador.
Don't give deep meaning about things happening on Singapore since first they are rich country and they can survive even if there's no crypto on their circulation. They are just been a crypto friendly since they see a widespread of demand thru their citizens about it, so if there's adoption the same with El Salvador will happen to that country I think this will not happen any soon since there are so many things need to consider before making it as their legal tender to happen.