Yes, they release particles in your body and this seem to cause issues for at least some people. But if there is a long time span between getting the implant and chronic health issues appearing I don't think people will be able to pinpoint that titanium implants might be the cause.
What the article writes about scalability also applies to availability. Does the queue need 99.999% or 99.9999% uptime? Or is the Service Level Objective actually 99.99%, 99.9% or even 99.5%?
With 99.99% you can have 4 minutes of downtime a month. If failover to a hot standby takes a minute then that shouldn't be a problem to achieve a 99.99% uptime SLO.
There are limited publications about the possible effect of titanium implants, for example https://pubmed.ncbi.nlm.nih.gov/30174768/