Been using Stripe for years. There is no more fraud protection there than any other merchant credit card account.
Regardless if they are blocking a lot or a little, they all let way too many fishy charges go through. They are just not incentivized to police fraud because in e-commerce its you who are on the hook for the charge back, not the bank or credit card company.
You cannot rely on your merchant bank (Stripe or anyone else) to do your fraud protection. You will get eaten alive.