I'm not sure how it will work but if we can quickly exchange it into Bitcoin on the lightning network than it will help make Bitcoin stronger.

If i ran a business I would accept all the shitcoins and quickly exchange them into Bitcoin.

Eventually all the shitcoins will disappear. Accepting the shitcoins and exchanging them into Bitcoin helps Bitcoin succeed.

Who is paying the development of tether into the lightning network? Is it tether themselves? Where do they get the money for this development? How are they so rich? I suspect it's for money laundering.

Either way. Bitcoin wins in the end. Tether will eventually disappear.