JFTR, "Symbola" font[0] actually is not an opensource and just freeware for personal use, but it was "fully free for any use"[1] till February/March 2018[2].
BTW, Even in actual state "Symbola" is my fav font for emoji input on desktop (via Gucharmap[2]) and mobile (via UnicodePad[3]).
Namely these (paraphrased) snippets:
1) The developer retains all rights to previous, current and future versions of UFAS.
2) Users are prohibited from network installation.
3) Users are prohibited from redistributing UFAS.