The same happened with HIV, these kind of conspiracy theories are inevitable. People always want to blame someone, even when there is overwhelming evidence that a natural catastrophe occurred. Remember the Italian seismologists who got sued because they didn't predict an earthquake?
Fact is that if the virus escaped a lab, the incident could have occurred in any other lab, too. It likely evolved naturally, though, and another fact is that it could have occurred naturally in many places in the world - e.g. in the Middle East or in Africa -, and a more dangerous virus could evolve in many regions of the world at any time.
Many people just don't want to accept this, especially those who reacted in the wrong way to the pandemic initially. It's always easier to blame someone else.