Hmmm, it's really sad (but not too surprising) to see that some people will always try to exploit the system. Very well, it can be fixed this way:

1) A user cannot have more than, say, 100 tournaments in the "open" section of the Tournaments page. Do you want to create more? OK but wait until some of your tournaments start.

2) If a user membership expires, tournaments created by them (in the "open" status) will be automatically deleted, except the prize ones with prizes already provided.

3) Regarding the single eliminations tourneys, that might be a bug because pawns should not be allowed to sign up for another tournament if they are already playing (or signed up) another one. But the code is really old (8 years?) so I am not sure about that. I'll look at it.

Anything else? Sorry, I am totally consumed by other projects so I could easily miss other issues mentioned in this conversation.