Disroot image preview

Hi. Recently I’ve found that ${linkToImage}/preview/ is returning a full-sized original picture like a direct link. I’ve found that it’s a feature of NextCloud and OwnCloud, but they are self-hosted engines. So my question is: have you got any limitation for using this “direct” preview links? I mean that may be there is some unrestricted load?
I know that it’s possible to create a direct links on dropbox (not officialy) but dropbox have limitations for sharimg - if load will be very high account will lose ability to share files for some time.
Does Disroot have something like this? Or I can freely use preview links to provide images anywhere I want? In example the Laverna.cc Notepad or a web-server