So long as everyone using the platform can modify their own list, no it's not the same problem at all. The question is: do I get to decide who I listen to, or do you?
Solutions like this look great initially if everyone uses them properly, but everything falls apart when people inevitably start actively abusing the new feature. The design needs to handle assholes-at-scale from the outset.
You choosing to listen to something doesn't mean you also get to force whatever platforms you want, to carry whatever you choose to listen to.
I find it hard to believe that there is someone you want to listen to, who you currently aren't able to, because twitter deplatformed them.