Bandcamp hides their support email addresses inside of terms and uses policy. There isn't a single contact method displayed on any of their index pages. If you confront them with this, they do not acknowledge it, by simply not responding to your legal question.

In my personal experience, my account was hijacked, so I tried to contact them to unlink my associated Gmail and PayPal accounts, no reply whatsoever.

If you send a legal notice to Patreon's legal department, it returns this channel is not monitored error, and in the very same email, they claim they have no responsibility to address legal concerns sent to them through this channel.

No company or state organs are legally allowed to limit communication methods to a single method. In addition to that, if you lose access to your email address, even with the correct credentials, Patreon sends a verification code to the very same email address, to which you have no access to. Instead of deploying ownership authentication methods such as cross referencing government issued IDs with the data in their system and the payout methods you provided (In my case it was PayPal), they claim there's no 2FA activated on your account, and they give you bullshit solutions like change your browser and stuff. All of these are illegal, directly violating consumer protection laws. Also, they hide their support personnel names and titles to avoid individual liabilities. I can keep going.