I guess mailchimp is also doing this, banning/suspends accounts if the content you're sending is related to cryptocurrency or bitcoin coz I used there service before for free for 2000 limited emails to be sent for the newsletter of my site (https://bl4nkcode.info) but when I reached it over, I topup to continue their service then they suspend my account, saying that I break some of their terms about crypto which they never told me, didnt receive any notifications, emails about it when I used them in sending those limited email for free.

But twitter? I have several twitter accounts, also running small business but I can still use it.