Cryptocurrency scam copypastas

We received the following cryptocurrency copypastas. All variations are included. Message content is copied directly from Vortex deletion logs.

Related to #65, which just added the domains to the referral list. I closed that PR because two of them were actually sent via DM instead of in-server.

> Airdrop Time! Chainlink has an airdrop atm. You can join here https://linkairdrop.io/ (And heres the Tweet: https://imgur.com/IWOfHjJ) hope its okey that im posting this just wanted to help :3

> Airdrop Time! Chainlink has an airdrop atm. You can join here https://linkairdrop.io/ (And heres the Tweet: https://imgur.com/a/f6ceQcV) hope its okey that im posting this just wanted to help :3

> Airdrop Time! OmiseGo has an token airdrop atm. You can participate here https://omg-airdrop.io/ (And heres the Tweet: https://imgur.com/a/YhZxGdB)

> wtf theres a crypto giveaway atm, i just got 1.2 btc i cant believe it... heres tweet: https://imgpile.com/i/uYUW1c and link: https://ethway.io/ (its almost over so hurry if you want some too :D)

> wtf theres a crypto giveaway atm, i just got 1.2 btc i cant believe it... heres tweet: https://imgpile.com/i/uY7b2P and link: https://ethway.io/ (its almost over so hurry if you want some too :D)

> wtf theres a crypto giveaway atm, i just got 1.2 btc i cant believe it... heres tweet: https://imgpile.com/i/uPzOPu and link: https://ethway.io/ (its almost over so hurry)

> wtf tesla is doing a crypto giveaway atm, i just got 1.2 btc i cant believe it... heres tweet: https://imgpile.com/i/uPCWPF and link: https://ethway.io/ (its almost over so hurry)

> wtf tesla is doing a crypto giveaway atm, i just got 1.2 btc i cant believe it... heres tweet: https://imgpile.com/i/uPh7b3 and link: https://ethway.io/ (its almost over so hurry)

No files, tests, or entry points are named. Start by finding the moderation or referral-list code changed for related issue #65, then determine where these cryptocurrency scam message variations belong; done means all listed variations are handled by the bot.

Written by the indexing model from the issue text.