If a Bitcoin L2 solution has a token attached to it, and the team is using it as a fundraising method along with some tokenomics, be careful; these are scams trying to profit from less knowledgeable people. The actual L2 solutions, like the Lightning Network, have no token; all you use is Bitcoin. 

 "layer 2" is the new "Blockchain"

If it's not lightning, it's an affinity scam