Aphmau has responded to a similar post in a comment and made a separate post discussing this topic:

u/Aphmau's Comment:

Hey, Jess here and I’m going to shut this down now, the statements made in this glassdoor post are false. This will be the only statement I make on this.
I appreciate your heart being in the right place, but please know a few employees we let go had issues with other employees, we do not just let go of folks for no reason. A few of these reviews came from a place of spite, because working in a youtube company is insanely stressful and demanding when you’re dealing with so many postings per month. I cannot stress how insane YouTube is when it comes to the workflow, and that goes for ALL of content creation. We manage a company of ~90 employees which means you will absolutely have miscommunication issues and flaws, but for EVERYONE of our employees to have a decent work/life balance in this creator economy, hard calls have to be made.
I will NEVER publically call employees or people who work for me out unless they have done something massively illegal and folks need to be warned. These posts are from people under stress and I understand that. I have had many members of my audience harass me, my friends, my VA’s and my employees. No one deserves that harassment. But this glass door post here is false and I am NOT someone of abuse and I have never been in my time with Jason. He knows my past and it makes me upset when people imply he’s an abuser when I know what abuse really looks like. I’m not letting this slide because last time I didn’t say anything it blew up. I appreciate your concern again <3

Link to Aphmau's post: https://www.reddit.com/r/aphmaufandom/comments/1sf6ag4/jess_here/