It absolutely can, but doesn’t always. For example, Gamer’s Nexus is well respected for their thorough and unbiased research and journalism. It would be extremely difficult for them to do so without ads and merch sales, as any products reviewed must be purchased, testing equipment needs to bought, and experts need to be hired to use said equipment. Until capitalism ceases to exist, most people who make stuff will need to find a way to fund their work, from paint brushes to high-end testing equipment.