The internet searched for any potential way the remaining Avengers could defeat Thanos and bring their friends (and half of the population) back.
So the internet is free to speculate to their hearts’ content about what would have happened if Ant-Man had tried to blow up Thanos.
Sure, there’s the fact that he’s played by the incredibly versatile Paul Rudd. Maybe it’s the fact that he was an active member of the time-heist in which the Avengers stole the Infinity Stones back from Thanos.
Thanos would be obliterated in the process. While it’s an unlikely solution to the problem, it’s also perhaps the simplest.