Google Chrome is ditching third-party cookies for good. What does this mean for Mautic?

I understand that soon third party cookies will not work anymore.

I am trying to understand the implication of this.

Having domain.com and hosting Mautic on domain.com/mautic will be ok.

When using domain.com and hosting Mautic on mautic.domain.com will that be ok? Will that be a first of third party cookie?

I understand that having a client with domain.com and hosting Mautic on username.provider.com will for sure not work anymore.

I am using 1 Mautic install now with the tracking code on about 10 domains and landing pages. If cookies from a subdomain are first party cookies maybe there is some way to use Cnames?