offer a moodle-plugin
moodle is a VLE and used by millions of students and 10000 universities.
All of them need slid.es to be an activity.
It takes not so much to write a plugin - but imagine: all teachers need an account at slid.es if they want ot use it. Yes, they can embed it already, but if it is integrated as a moodle plugin - they learn about it.