Sound like atak it is a military app

I use next cloud calendars I can sync it with my phone using davx

And on mobile I use Feeder I just exported my follows from my pc and imported that to mobile

Also, you can follow lemmy feeds YouTube channels, podcast and more

i use Yarr

For a non federated option I love guilded

To my understanding your isp is only passing on the dmca which means that the dmca is meaningless unless the rights holder acts on it. So take away from that what you will