Some social media users questioned the Mars rover’s £2.05billion ($2.9billion) price tag while others bizarrely claimed the landing was an elaborate hoax.
Others, including UFO hunter Scott C Waring, accused NASA of not being entirely upfront and honest about the mission.
Perseverance has already beamed back tens of thousands of pictures back to Earth, snapped during its descent and after landing.
Some of the initial photographs, however, are fuzzy and obscured by digital artefact – a common theme among the unprocessed, raw images.
Mr Waring took to his blog UFO Sightings Daily where he alleged NASA had deliberately blacked out the image.
The UFO hunter said: “Now NASA spent $2.7billion on the rover mission, so you know they have the best state of the art technology on it… meaning the cameras are the best Earth has to offer.