Unlike wind and hydro, which require dealing with governments and experts, solar can be sold to anyone with enough money to buy it.
This means that there are a ton of scumbags looking to profit off of those who do not know any better by spreading misinformation and, well, any other tactic they can think of to enrich themselves further.
Ok, those are two other options for energy, but I said other industries. Every single product available to consumers has this problem. It’s not specific to solar energy.