It's a patched version of YouTube IIRC

+1 for ReadEra! Besides .pdfs, it covers a lot of ebook file formats, like .epub, .mobi, .azw3, etc. I typically download .epubs because you can change the font and font size, as well as use dark mode quite easily that way. And it looks like the most recent update now has TTS available for Premium users. It's a very solid app, and is my top choice as well

One possible solution: if OP is allowed to connect their phone to their work computer, and they have a rooted Android phone, they could get around this using VPN tethering. I'll spell out how to do this, in case someone else can benefit from it.

What's needed:

• a rooted Android phone
• a VPN based ad blocker (Blokada, AdAway, etc)
• a USB cable
• a VPN hotspot app

Steps:

1. Connect your phone to a VPN based ad blocker
2. Connect your phone to your computer
3. Open the VPN hotspot app. Turn on USB tethering, then rndis0

If it doesn't work, try turning on USB debugging on your phone, or changing default USB configuration under Developer options

Used it for a while. I quite liked it, but ultimately I switched to an LTSC build because there was an issue with configuring my printer's driver that I couldn't resolve. The tweaks likely got rid of a dependency that the driver used