I will give you a list of 5 coins that I earned without spending a dime on them. Also, I did not have to put in any work - blogging, bounties, surveys, etc.

I will be listing only coins that made me $100 or more. I will also share the way I got them.

Energi

Back in 2019, there was a massive airdrop that earned me 110 NRG coins. I spent most of the time after that staking them so until now they are worth about $400. They can be exchanged at any time on Kucoin exchange for BTC or ETH. As of today I am keeping my NRG in MyCointainer and earning interest every single day.

BitTorrent

I earned completely passively about 150 000 BTT by seeding torrents on my home PC. Currently, I have an issue with withdrawing about 90 000 of those and I'm working with TRON support to fix that. In any case, I have at my disposal about 60 000 BTT which are worth over $230 as of today. BTT is located on the TRON network and its transactions are paid in TRX and quite cheap compared to any ERC-20 token. Also, It's important to know that the wallet I use TronLink is capable of connecting to multiple DApps on the TRON networks that give you nice opportunities to stake, swap, and many other options.

https://sun.io/ is one of the places that are worth checking. You can stake/mine without the coins to leave your wallet. Justin Sun(TRON creator) has been pretty vocal about this on Twitter.

Presearch

I have earned about 2850 PRE from using Presearch add-on for Chrome in the past 2 years. Currently, that's with almost $300. There is plenty of information on Publish0x about this one. Including my article from a few days ago. If you are interested in joining my team please click here.

Electroneum

I started mining Electroneum on my phones about 3 years ago. I used several phones and different accounts. It was a free cloud mining service for a very long time. The amount I managed to save in ETN for a little over 2 years(they disabled the cloud mining a year ago) was about 8000. I recently exchanged most of those at $0.035 which gave me about 280 USDT. There are several other projects that are trying to copy Electroneum model so far unsuccessfully. If you guys hold some ETN you can trade it on Kucoin. Also important to mention is that ETN is the native token for a website called Anytask.com where you can find work and get paid with Electroneum. It works in the same way as Upwork or Fiverr.

There are more coins to add to this list however they do not qualify for different reasons. The amount costs less than 100$, I had to put some work into that(blogging, answering surveys, refer people).

I hope this was interesting for you guys.