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I would leave it up to the ad owner if his ad should be removed. Specially when they have paid for posting an ad

if you want to generate password for your users and not include special chars you need to edit

framework/includes/views-login.php
line ~474

$user_pass = wp_generate_password();


change...

Yoast does not understand that this is a 'template page' and is looking for content, the content will be indexed by Google when its crawled so i dont think you have anything to worry about.

Could you post please what you are doing and see this message?