They aren't manipulating anyone... they're just making it known they'd prefer not to be linked to from another platform.
Is this a reasonable expectation? I'm not sure -- my gut says probably not. Is it a reasonable request? IMO yes.
Contrived scenario for expository purposes: lets say I'm an expert in pre-civil war era southern cuisine. If I find out that people on stormfront are linking to and discussing my posts for their own agenda, do I have a right to make them stop? Of course not. Is it reasonable for me to say "I'd prefer if your platform didn't link to my blog"? Of course it is.
It is a reasonable request to ask your neighbor to take down their billboard that says "THE GUY NEXT DOOR WROTE ${THIS} BLOG POST AND IS A REAL PIECE OF SHIT", even though they aren't obligated to do so. It becomes unreasonable when you expect that they take it down.
Obviously depends on the jurisdiction.
Everything depends on jurisdiction, that's the very nature of law in and of itself.
Personally I just follow foone on twitter, since their an interesting person.