You can always stay unlimited time in the Philippines. No visa runs, no hassle, no need to pay income tax.

Thailand is much better though.

Almost every country works the same in this regard. In most cases, you become a country’s tax resident by staying there for more than 180 days within a year. Then you pay their local income tax (if applicable).

OP has said nothing about giving up his citizenship. And no country on this planet will grant him another one for being a ‘digital nomad’.

The Philippines has 0 tax on foreign income unless you are Filipino.