Buy a domain. Get Proton, or Apple, or any other custom-domain email service.
Setup catch-all incoming mail.
Every merchant receives an email like merchantname@donotwriteto.me
Then you can either sort those out, or if they are malicious and not deleting you from your email lists, you can block the incoming traffic on that email.
This way you still can verify your email, comm stays private and you can have your own peace of mind, but you don't have to keep the spam in your primary inbox.
My old Gmail would be loaded with spam and the filter would screw up and mislabel legitimate mail. Now, no spam at all.
It also helps when your email is involved in a data breach which is becoming the norm now.
Although be prepared for awkward in person interactions when a business wants your email. Everything from "no, your email silly not mine" to "I own this business name you can't have it in your email address"
But for something like netflix, I create a list. And when I start repeating something like Seinfeld, Breaking Bad, etc. rather than not-yet-watched items from the list, I cancel the subscription. And I don't renew till some time passes (6 months). Only then there are a few different movies/ series I can add to the list.
If you ever need to use the service again just re-subscribe (and re-cancel)
In fact, what is stopping you from cancelling all your subscriptions right now? You can always buy back in when you like
So yeah, not all companies do that.
If not, time for a charge back with your card provider.
I've done it multiple times when a vendor was behaving fairly and it always went through.
I don't recommend doing it to a vendor you plan to have business with again in the future as they might ban you (eg food delivery apps)
Love seeing companies worth tens or hundreds of billions acting like they couldn't spare a cent from underhanded shit like that. Scrooge McDuck type of behavior, except he also had some redeeming qualities.
If you rotate subscriptions sensibly, they're much cheaper than the old cable model. If you're not looking, they can really bleed you out and be much more expensive than the old model.
Most people are literally paying so they don't have to set all that shit up again and the cost is trivial to them.
If that's not you, fine, but my point is that nobody is "right" about this topic. Services exist because they make money.