I think the risk in a long outage like this is people will just go elsewhere. Bankroll investing is already risky on a day to day basis, coupled with lower play volume might not be good for those of us that have funds there.
I wouldn't consider that a risk to your investment. The wagering volume fluctuates all the time, people leave for various reasons and new players join in.
Further, I do believe that most people understand the nature of things well enough to not hold this against a site.
DDoS attacks are something that, sadly, every site likely struggles with at some point. They cannot be fully prevented, they can be mitigated and worked against, CDNs like CloudFlare help and give tools for that,
but depending on the type of the DDoS and its size, that can take time. We've seen that in this case and we've seen it in the past with other gambling sites struggling under similar conditions.
If you choose to leave however, go ahead and do so.
It's gonna benefit all remaining investors by increasing their share of the profits made.