Spark and its parent company Lightspark don't get much love around here. Spark gets billed as an equal to lightning or at least something with similar trust properties and the reality is that it requires more trust than any self-custodial lightning wallet. Enough so that it gets called trustodial.
However, this interview with Lightspark's founder and CEO is pretty interesting. David Marcus was CEO of Paypal in the early 2010s and talks about being a bitcoiner during that time. He also was the primary force behind Facebook's Libra currency -- the death of which he describes in great detail.
Finally, he has been focused on Lightning for a number of years now, building the lightning tooling that is used by a number of major exchanges, and he has some interesting thoughts about the current state of lightning.
If you'd like to add a little nuance to your opinion of Spark as a company, consider giving this interview a listen.
Marcus has been in the room for some massive pivots in digital payments. Seeing his shift from PayPal to Libra to Lightning is a fascinating arc.
Spark still requires Lightspark to co-sign channel closes in most cases, unlike self-custodial LND where you can force-close unilaterally even if the peer is offline.