This icon doesn't necessarily mean that something's wrong with a domain
Our domains, where promotional links are placed, periodically end up in databases of malicious domains. Currently, the frequency of domains being added to these databases is approximately once every 7 days.
Domains with a question mark may be already in some databases, you can check them yourself if you want. We use the https://virustotal.com service for verification and are constantly working to ensure that the lifetime of our domains is as long as possible.
Hope it helps. As an alternative to our built-in domains, you can use your own.