in principle, any brokerage regulated by the FCA (UK), ASIC (Australia) or CFTC (USA) is safe
many others are “regulated” by fake regulators paid for by the brokers they regulate: for example, being “regulated” in Vanuatu or the Caribbean island countries is the same as being unregulated, in all the ways that matterto the customer
more is explained here (and in the posts following this one):