The comment was about ScribTeX, where I cannot invite others (unless they already have accounts) but still I can (or at least - could recently) upgrade to payin

The comment was about ScribTeX, where I cannot invite others (unless they already have accounts) but still I can (or at least - could recently) upgrade to paying plan (without any warning that ScribTeX is no longer accepting new users). ShareLaTeX - sure, I know and understand.