niKee

Will this allow the member to use the same password as they had before? Kind of defeats the purpose if they can.

What would be awesome during password selection to reach out and use https://haveibeenpwned.com/API/v3 as information apart of the password strength-o-meter.
 
 

You can Improve the "Rank" system, making it more similar to "level system" of Steam as example. 
By this way, members will be able to upgrade with more than posting content, using custom criteria to earn "points" that will be used to level-up. And also add an interface to show members their actual account level and how many points they need to upgrade to next level/rank. 

You can Improve the "Rank" system, making it more similar to "level system" of Steam as example. 
By this way, members will be able to upgrade with more than posting content, using custom criteria to earn "points" that will be used to level-up. And also add an interface to show members their actual account level and how many points they need to upgrade to next level/rank. 

In my expirience unfortunately there is too much false positive bans with "spam defence" even if only "User is a known spammer" option is used, so i'd recommend to use this feature carefully and set it to "Flag the account for manual review" instead of instant ban or preventing from register.
Also it would be great to have option "Allow user to register as normal but mark it as possible spammer for further review" which will allow to register without any restrictions but moderators will able to check this account later (for links in profile, etc).

A "premium" Club where you have to pay for access is an interesting idea