I'd recommend adding a merit requirement for all new applicants from now on. This will help to reduce spam, since those that haven't obtained any merit usually don't know how to contribute valuable discussion to the forum.
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If you check the application form you will see that Best Change already included merit as a factor when choosing new participants. Minimum needed is maybe not explicitly set, but it is obvious that it is something that they do check.

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Regarding this new change, more wiggle room, the better.