Minnowbooster recently started a whitelist for their vote-bot services, and it seems like there is no end to the people who want to be a part of it. That's not surprising: votes for whitelist users are more profitable and more readily available. Plus there's the added benefit of being able to participate in evaluating new users for the whitelist, and earn an affiliate commission for their future vote purchases. I was lucky enough to be one of the first wave of users on the whitelist, and I thought I'd make a post about how the process works from a voter's perspective. 
Blue votes are available to normal users, green only for the whitelist.
Once a user is invited, they get added to the voting page, which only whitelist members can see. From this page we evaluate the account and vote to accept or reject the user based on the quality of their posts. A user needs five yes votes to move from pending status to acceptable,and five no votes to move from pending status to rejectable.
Whitelist activity page.
In starts with invitations. Every user who is added to the whitelist starts with two invitiations. They're precious! Our job is to find excellent posters and invite them to the whitelist. If an invitation is successful we get two of them back. Because each user has so few, they're being spent carefully but quickly, and we usually don't have them to hand out to people who ask.
The voting page. Names blurred for privacy
We also have a comment box where we leave the reasoning for our vote for the Minnowbooster admins to look at when they do their final review. Once we've invited or voted on someone we can see the status of their application in the Whitelist Activity page. I left some of the usernames in this one because they're really obvious; most of the first invites were no-brainer yeses. (The comment field is just my comment, I don't get to see anyone else's.)
The voting page. Names blurred for privacy
We also have a comment box where we leave the reasoning for our vote for the Minnowbooster admins to look at when they do their final review. Once we've invited or voted on someone we can see the status of their application in the Whitelist Activity page. I left some of the usernames in this one because they're really obvious; most of the first invites were no-brainer yeses. (The comment field is just my comment, I don't get to see anyone else's.)
After a user gets five votes they move out of the voting process and into the admin review process, where a Minnowbooster admin looks at the votes and approves or rejects the user. Just because someone has five votes doesn't necessarily mean they're going to be accepted to the list, but so far a large majority have been. I doubt someone with five no votes would have their voting overturned.
Votes are more common than invites; everyone started with ten, and if your vote matches the final decision you get two back. I'm almost always at zero invites, but I've only been at zero votes once; by and large I get them back faster than I can find time to evaluate accounts. (And I've been doing a lot of that. It's addictive, and I've found a bunch of people to follow here by reviewing their accounts.) The voting process has generally been working pretty quickly.
Commissions page
If you're a user looking for an invitation,
has created a post where you can comment to suggest whitelist voters look at your account. Minnowbooster is also looking into some other options for users to suggest themselves, but I don't think any of them are quite ready yet.
If you're a user who has been invited and you're looking for votes, by far the best thing you can do is make an excellent post on your account. We're going to be looking at and judging your content, so you want to make sure we're seeing your best work first.
Please note I do not work for Minnowbooster, I'm just a user who was standing in the right place to get whitelisted right away. I'm happy to help with whitelist-related questions but I am not Minnowbooster support, and questions they need to answer should be directed to them on their Discord. We also have a whitelist-specific forum there where you can ask questions.