Need a Reddit/Slack Mass DM Bot

What I have

• List of 21 Subreddits containing 5,707,700 users
• List of 56 Slack Servers containing 113,237 users

What I need

• A bot to message these users

Why

• A extremely lucrative affiliate program is giving away 30 day free trials and it's a great opportunity to create a substantial residual income

I can definitely solve this but the reddit messaging problem on such a scale has one big problem that you will run into, I'm curious have you run any manual tests to see how much you get blocked? :

Domains get blocked pretty quickly and reddit will ghost all of the messages that contain that link once a few people report it. Can you provide at least 100 domains? Tinyurl and the like are filtered so aren't viable solutions. I picture a good way to check when domains are being blocked which I'll keep private

Age is important with the accounts. New accounts get filtered very quickly and even aged accounts can't send a lot of PM's.

Interested to hear your response, feel free to contact me and I'll solve this.