Is it possible to guess cvv code from ccn and ccexp?

If i am not wrong, visa is easy to guess cvv right?

Let’s say if I have 100,000 credit card numbers and expiration dates, it is possible to make daily 5 guesses.

All cards with 5 the same gateway/Api of payment and cards will not get blocked due to multiple attempts?

If yes, then it’s possible to create like 10 APIs and check them with 50 cvv attempts daily.

So, in the end, we get all 100,000 cards’ cvv codes in 20 days (50 guesses 000-001-002 daily)?