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I have a stack in place built around Tailscale. I mean, this may not be the best route but, hey, it works for me.
So I have Tailscale running across my devices. Within Tailscale, I have enabled Mullvad Exit Nodes for some privacy control. Then I have overridden the default DNS setting with NextDNS.
Within NextDNS I have a standard profile with some ad and telemetry blocking which is typically for the family devices and then I have a disgustingly pimped up profile for my main devices with a hell of a lot blocked, including domains that I do not care for (facebook for example).
The pros are that I can control all connections easier, even when out of my home network. That said, it takes some setting up to ensure I don’t bork connections. And, yes, I learnt that the hard way when I blocked all ‘meta’ tools across my whole network and the kids lost it!
It has already been said but the company is complying in the sense that it is providing a solution whereby you can delete your account. That said, where you are unable to follow that process, they should offer you the same ability via email. Each company does things slightly differently but I would hazard a guess that an email stating that you find it more reasonable for the action to be carried out via email, they would be likely to comply.
The reasons why companies put these in place is simply to avoid mass requests for deletion and, as stated, to also protect you.
While email spoofing has been mentioned, it is somewhat unlikely anyone would send a request for deletion after spoofing your email, yet, it is not impossible.
You may have to be persistent, could use services that support or even get some pointers from the ICO. Here is a really good link https://ico.org.uk/for-the-public/your-right-to-get-your-data-deleted/
I wish you luck