Let's add to this that for more lunatics using Spark wallets, will be more submarine swaps.
That means an increased fees for routing and channels balancing.
That means LN will no longer be so "cheap".
That means the costs of running a public routing node will be increased and regular node operators with less resources will stop routing.
That means slowly the whole decentralization of LN routing will end up in few big LSPs connected to these crap sidechains using submarine swaps and controlling all the traffic.

STOP BEING A USER OF THE PAYPAL MAFIA (SPARK) AND KEEP YOUR SATS ONLY ON SANE LN, NOT CRAP SIDECHAINS !