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Of course it's possible to earn crypto coins during quarantine. There are many ways and yes bounty and airdrop are one of them but i love to say that many good projects don't run those kinda event though. But you can also earn those projects coin if you have enough skill to promote their project properly. Just reach out by their mail address and submit your offer to them.
I don't like your idea about exchanging crypto for fiat money. Try to use crypto asset as alternate fiat money (if it's possible). And yes you will be cheated if you are not much careful because scammers are everywhere to scam you.
It is really possible for everybody to use bitcoin while they are at their homes. As long they have their own internet connections and technology such as computer and smartphones they can already earn and used cryptocurrency. They can start from buying cryptocurrency and start doing and learning trading, they can also start from making their joining signature campaigns here in this forum, and they can also earn from mining using mobile phones.