I can hear Substack marketing saying that “We don’t have any intention to put you into a vendor-lock.”
I had a lot of discussions with companies about their marketing.
Why do you upload your events’ photos to FB instead of your site?
Why do you have news on LI feed and don’t make it a post on your site as well?
Do you think they can hear it? :)
Substack is going to become a similar service as FB, LI are… no possibility to export your data easily or not at all.