[beck5]

Sorry I don't fully understand, you can invite collaborators on sharelatex into the project via the project settings area. Free accounts are capped to having 1 collaborator (1 person + yourself). Please drop me an email henry.oswald at sharelatex.com

[stared]

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.