> 99.9% of websites on the Internet will only let you create one account for each email address.
Is it common? That seems like useless and impractical limit. E.g. for e-shops, one would like to have separate accounts for personal purchases and for business/corporate purchases.
It's kind of weird when you can login to different accounts with the same username, which is typically the email address. I mean, amazon lets you do it, and I've had two accounts with the same email address and password there; but it's still pretty weird. IIRC, I had two accounts with different addresses and changed them into the same address. A lot of accounts don't let you change your email address at all, so they solve the problem that way.
Is it common? That seems like useless and impractical limit. E.g. for e-shops, one would like to have separate accounts for personal purchases and for business/corporate purchases.