I would argue that it depends on your definition of harmless mate.
Sure he doesn't hurt people, and doesn't cause them physical or bodily harm. However that's just because he is a massive vagina that only talks big from behind his little gated community and cum stained keyboard. Phil has taken from society, and he has returned fuck all. No one will be at a loss if we don't get another Street Fighter stream, another "Podcast" or glasses/vest/hat animation.
Everytime Phil is on stream he lies about being near poverty, he's pulling those heart strings as hard as he can. It works for him because unlike himself, people like helping others. So they find him and hear him whinge about being poor and they might think something like "Oh this old bloke is really in financial trouble. I'll give him this tenner, he might need it more". Some people aren't aware that he makes upwards of 100,000$ yearly. Most of the people supporting him, or falling for his scam are children, teens or actual wheelchairs that don't even make half as much. So let it sink in that this fat retard is crying poor while sitting in his Zelda jammies door dashing food, wine and opening WWE packs while some family out there could actually need the help because they actually don't know how to pay their bills, put food on the table and whatever else. So I believe Phil is greatly harming his fellow man.
What also does my head in is that Phil is in fact a con artist. Not only has he time and time again scammed his fans, and banned them when they called him out. He also scammed the government, several times. I will just mention the very clear bankruptcy scam as the most recent one.
So while he's not going out there and beating up kids to steal their money, I believe he is still harmful with what he's doing.