I have, for some years now, tried to earn as much crypto as possible while doing as little work as possible. After some time I think I can put down my two must haves:

This one has, and will always been my favorite. Most of you have probably heard of it, but I will still write it a glowing recommendation.
You need a smartphone for it to be truly idle - as well as about 30k btc deposited. Then, once an hour, your phone will claim the (very standard) faucet, every day.
You also earn Reward Points for every claim you do. Recent updates made them rarer, but reduced the price for their most used use-cases. A 1000% boost in faucet-rewards for 24h will now cost from 800-1100RP, while a 50% increase in the faucets reward only will cost ~50RP.
Other ways to earn Rewards Points, is to play dice, or bet. You earn 4 RP (about once a week there's a 48h promo where you get 2-5x RP) per spin It's betting is actually really fun - you can bet on upcoming football games, upcoming Formula 1 races, as well as what the price will be on ETH, BTC and FUN every month. This makes it a tad easier to earn RP, as one example of a bet on BTC is "37500-40000$". You get 1 RP per every 500 satoshi wagered, while you get 1 ticket to win a lambo (!!!) every 500 000 satoshi you wager.
Freebitco.in has a collaboration with $FUN token, which means that you can both sell and buy $FUN as well here. The more $FUN you own, the more perks you will get, such as free spins per day (A wheel of fun), cashback, higher interest boost (There is already an interest boost for keeping over 30 000 satoshi on the site), and more.
STAKECUBE

This one is a little tricky, and I was very weary at first, as it has many obscure cryptocurrencies, (with faucets), but you seemed to have to invest to make it work.
You can earn StakeCubeCoin (SCC) by retweeting tweets on Discord, and you can use SCC to start a MasterNode, or buying workers. Workers will mine for you, which in turn will let you buy more miners.
But the best feature of StakeCube, lies in it's name - staking.
It has really great rewards on your crypto, and you will most definitely notice the numbers going up just having your crypto there. Last 30 days I earned 0.01029158 DASH, while only having 1 dash deposited.
Another great feature of StakeCube, is it's MasterNodes. Whether you start your own, or buy into somebody elses, it will also accumulate a nice reward (while still counting as benig staked), making the opportunities for earning idle money here very fun! It's also a great way to keep an eye out for new niche-cryptos - there is a focus on anonymity over the currencies.