But  nostr:npub18ams6ewn5aj2n3wt2qawzglx9mr4nzksxhvrdc4gzrecw7n5tvjqctp424, it is also correct that Nostr allows us also to have a portable digital social identity that allows us to be anyone, right?
Looking at the  nostr:npub15dqlghlewk84wz3pkqqvzl2w2w36f97g89ljds8x6c094nlu02vqjllm5m profile you mention and the posts that are done, I can hardly believe that this is THE Michael Saylor. Michael doesn't strike me like the kind of guy that posts generated bitcoin images all the time. 
My thinking is that the followers of that profile purely comes from the fact that someone created this profile early, and managed to get enough followers to get the snowball rolling. If this is the case, the real Michael Saylor might have a hard time building a web of trust later on.

But I'm very new on Nostr, so there might have been some back and forth in the beginning when that profile was created to establish that is actually is THE Michael Saylor. 
Funny enough, one of the first private messages I received after creating my profile on Nostr was from.... Michael Saylor himself! After my first surprise, I realized that fake accounts exist on Nostr 😄