I just want to get some more opinions whether it is a proven method to earn free cryptocurrencies, and if yes,
It is a proven method that you can earn dust amounts for free so if that's the question, then the answer is a yes.
will it be worth my time and efforts on those platforms?
For me, it's not worth my time anymore. Faucets are good for newbies just to know that this is possible to earn and they'll have a glance and a way of earning a few of these cryptos. But if you're going to make it as a source of income, you gotta need a lot of spare to collect such decent amount on it.