It is a very good policy for convenience, having seen the the other side - the customer support side - I think this should be implemented everywhere.

you can write the password like this: " abc def ghi " and copy it to a peace of paper, or copy & paste.

It is simply easier to strip all spaces, then to keep telling all the users:

• "Make sure you are not copying and pasting an extra white space character"
• "Type in the password manually, and do not copy-paste it"

which is usually an answer of the question:

• "My password is not working, even though I copied it exactly as is from the email you sent me"

It’s a very good policy for convenience, and having seen this from the customer support side – I think this should be implemented everywhere.

You can write the password like this: “ abc def ghi ” and copy it to a piece of paper, or copy and paste.

It’s simply easier to strip all spaces than to keep telling everyone:

• “Make sure you aren’t copying and pasting any white space characters”
• “Type in the password manually, don’t copy and paste it”

Which is usually an answer to the question:

• “My password isn’t working, even though I copied it exactly from the email you sent to me”