Server members that break the empty-room problem every new Discord starts with.
Neither. All we need is a public invite link that does not expire and has no member limit. Nothing is added to your server, no role is requested, and nobody gains any permission. If a service asks you to add a bot or make it an administrator, that is a different arrangement and a much larger risk.
Create one set to never expire, with no maximum number of uses, and leave temporary membership off. A link that expires mid-delivery stops the order partway, and a use limit caps it wherever the limit falls. This is the single most common reason a Discord order stalls.
No, and we would rather say so than let you find out. These are members, not participants — they raise the count that decides whether a real person accepts your invite. The conversation is still yours to start; what this buys is a room that does not look empty when they arrive.
Some do, which is why the service carries a 30-day refill guarantee — tell us within the window and the shortfall is topped back up. Do not run a mass prune or a raid-protection sweep during that period, as those remove the delivered members and the refill cannot tell the difference.