It's not surprising, IMO. A lot of people are getting into the bitcoin these days. Certainly few of them are also in LN. Some services are introducing this to their customers. Besides, LN is supposed to be adopted in a large scale in the coming years. In my opinion, the growth rate should be far higher by now.
Also we have Bitcoin RSK network with very low cost.
What's that? Until now, I haven’t heard this IIRC.
I haven't had a chance to use Bitcoin lightning yet but I'm pretty sure it's convenient compared to regular Bitcoin transactions with the traditional network.
It's not that hard; at first look, it may look hard though. You may have a try-
A Beginner's guideline to Bitcoin Lightning Network