and there’s almost no high volume Bitcoin services/exchanges that accept it.
Here I think you're wrong, if nothing changed in the last weeks then we have the following popular exchanges accepting LN:
-
Bitfinex (see
here)
-
OkEx-
Bitnovo (leading Spanish exchange)
-
FixedFloat - Changelly-like exchange
-
HodlHodl - P2P
-
Paxful - P2P
OkEx and Paxful have added it in the last months, while Bitfinex accepts it since 2019 or 2020. There are a lot of other smaller exchanges and services, see
this list (in Spanish) and
this website. Kraken seems to be in process of adopting it, although I'm not up to date about the current progress.
Bitrefill also accepts LN payments.
Exchanges accepting LN will result in more traders engage in arbitrage, and I don't think will result in a lot more adoption of LN. Services and merchants accepting LN is what will really drive adoption.