Can somebody help me understand the recent issues that the manga reader Tachiyomi is facing and how to bypass them?

I have some idea that the devs got DMCA notice from some company and they are trying to shutdown the forks as well. I also read that some extensions won’t work or need to be added from unofficial sources. So my question is how to get back to the smooth experience as before with trustworthy extensions and forks. If there is...