I have for the last 20 years used different everything (ie: email, name, phone, dob) for different websites with different combinations for each one of them.
It gets difficult and confusing and I had to create a database to store my hundreds of personalities. I keep it air gaped and with some exceptions I have to be home to do most stuff. Which is cool because I don't trust other networks anyways, after all paranoia is one of the symptoms of multiple personality disorders.
But now the internet has grown to a point that I might have to consolidate my personalities to about a dozen different ones, and keep some of them looking real. Personal for family and friends, personal for acquaintances, personal for important businesses(banks, work..), personal for less important business(Amazon, cell...), personal for trash business, personal for governments(all), generic for active web forums (the reg), generic for trash web forums, anonymous for pornsites, anonymous for political sites (wapo, nyt, the reg?), and a couple more for some future needs. It's going to be difficult to add eight more facebook accounts, they're jerks.
I thought it was OK to do that because that's how businesses operate when they have many different entities under one single umbrella (Alphabet, Chaebols). Businesses are people right? So people should be businesses as well.
The only thing I wish is that I could have a dozen different social security numbers like they have different business licenses. That would make my dissociative disorder more manageable. Welcome to new world.