A serious mail provider would care about ensuring that this does not happen and handle enquiries sent to the RFC-mandated address postmaster@ and respond promptly to such enquiries.
I might have ignored email complaining about delivery issues if the above wasn't handled if I were running a serious email provider.
To this day is too much effort running your email service. I moved to an account to Infomaniak that works good and I don't dove all my data to Microsoft or Google.
That's why I meant the above as table stakes. They are the cost to even get in the game to get punched with bullshit IP reputation lists.
But if one doesn't have even PTR records, one has no leg to stand on complaining about blocklists.
I send lots of email that is verified with SPF and DKIM to them via relays. But any messages sent directly from "untrustworthy" IP ranges are just blocked with a generic message.
This is in contrast to GMail which rightfully treated my first messages as suspicious. But once a handful of users pressed "not spam" they don't care about what IP it comes from anymore as the domain reputation has taken precedence.