Similar: https://www.reddit.com/r/facebook/comments/1hxd0i8/i_am_locked_out_of_my_account_log_in_on_another/

It looks like a spyware from companies like Google, Meta and other harmful companies, started demanding more private data (phone, mobile app installation) otherwise they refuse to give you access to the account or even prevent deleting your account.

For example Instagram ends up with message:

You need to sign in on a device you’ve signed in from before and approve this login.

If you don’t have access to an alternative device that you’ve used to log into this account before, it’s not safe for us to let you log in.

When you waste some time finding out how to contact them or delete account ( https://help.instagram.com/370452623149242 ) you can not find any contact.

Is there anyone who knows how to delete the Meta account like Facebook or Instagram without having access to it and without installing their spyware apps to other devices?

I tend not to even use a burner phone in a default state with data disabled and VPN enabled and let the app leak some of the phone data. Having doubts if it would work to allow the access. I suspect not since i never logged the account from the device.

• One thing may be to forget. To close all the tabs of the Meta service and on the home page of the service, click address bar lock/shield icon and clear site cookies and Shift+F5 to reload with cleared cookies and then warn all friends not to use the company, mentioning more private alternative where they can find you.