hello @okkiedot !
It is difficult to trust strangers, but we can trust that they are most-likely rational, and behave in their own self-interest. We want to attract and provide benefit to people who are here for the long-term, and only wish to increase their 'stake' .. their presence .. their power. We want the type of people that power up very STEEM they receive, every curation reward, as soon as they can, in order to be able to curate more effectively!

Remaining 'in the club' will only be of benefit, and increasing benefit, to each member.

But you are correct, if someone joins with malicious intent .. to scoop a lottery win and leave, well .. there will be the following consequence - 50 people will MUTE and blacklist them immediately. We would then ask them to return the STEEM they have won, sending it to @the50 for redistribution - if they show no signs of doing so, they could be subject to systemmatic downvoting, that overtime would result in losses that surpass whatever they may have scooped from us. This is why we want to have content contributors 'with something to lose', relatively speaking.

If members have no desire to continue they can transfer their membership to another person with the same or more STEEM Power holding that the departing member has, and the new individual can pick up exactly where the departing member left off.

I will set up a channel on Discord and post about it very soon!