What does a bulletproof domain mean?
An abuse-resistant domain is a domain registered by a domain registrar that is physically located and maintains its servers in countries that do not have legislative leverage over the owners of these servers. This allows you to avoid blocking the domain under pressure from political groups, copyright holders, competitors, etc. In a number of countries, even the country's authorities cannot demand that the registrar block the operation of such a domain, since there is no legislative framework allowing this to be done.
Currently, in order to combat fraud (phishing, scam, etc.), a special procedure for accredited registrars and registries (domain zone administrators) has been introduced for international ICANN domain zones, which requires consideration of complaints and delimitation of domains in a number of cases, regardless of the legislation of the registrar's country.
For national domain zones, the procedure for considering complaints and actions on them are regulated by the administrators of the national domain zone, so each national domain zone has its own characteristics.
Thus, finding a bulletproof registrar for your project is currently not enough (and if your project has signs of fraud, then it is almost impossible), you also need to carefully select the domain zone.
Additional information: Who can block the operation of a domain