As I understand it, even if USDT were created on the Lightning Network, it would still not be authorized in the EU. This is merely a plan for Tether to expand its influence and increase USDT marketcap.
It is only a matter of time when rest of the world will ban USDT also, it's not going to stop with EU.
I don't think any stablecoins will survive long term, unless they are created by regulators, and that makes them worse than current fiat currencies we have.
Tether has its own calculations, and I respect that. Bypassing the EU market may not have a significant impact on Tether business. Additionally, Tether has invested in StablR - a MiCA-compliant stablecoin issuer. It seems that Tether is seeking to regain market share in Europe through this partnership with StablR ^^
I heard about StablR but they have a long road ahead to increase adoption, and they basically starting from zero.