Most businesses can treat their domain name as fail-safe. If you have a .com/.org/.net, pay well in advance, and aren't doing anything that's currently illegal in the US, you're not going to lose it unless there's a dramatic political shift that's earthshattering for ~everyone.
On the other hand, social media platforms arbitrarily locking you out is a daily occurrence for tens of thousands of innocent people per day. This isn't just a hypothetical risk, it actually does happen to people and businesses all the time. Even the most law-abiding business should not build their castle in a social media platform.
If you're at all legit, you don't have to worry about being locked out.
Everyone has to worry about being downranked to oblivion, which is the new normal on most SM sites.
Complete ignorance of the people who arbitrarily get flagged by algorithms to no fault of their own or get on the bad side of someone at these companies who have a grudge.
That's not correct, just on HN you can frequently see articles about people getting locked out of Google, Paypal, Facebook, etc. with no explanation given. I've been banned for suspicious activity on a social media site on an account I hadn't used in years, probably because someone was trying to steal the username.
A year is enough time to kill a business.
This is simply false. We were locked out of Meta Ads Manager for no apparent reason. When we contacted Meta customer support—setting aside the casual racism I faced for not being a native speaker—all they could offer was, "Oops, that shouldn't have happened; we'll refresh your account." As a result, we lost approximately $5k in business because we couldn't reach our audience at its peak.
Knowing what's more likely and what's less likely is still useful information: social media turning bad is a daily occurence, while dns registrars' family members have been safe for a pretty long time now.
Harassing people is far more accessible and has a proven track record of success.
Do you have examples of someone successfully harassing a registrar employee into breaking the registrar's ICANN accreditation terms?
Not so much with social media where the respective tyrant has a TOS that makes it clear they can tell you to pound sand whenever they feel like it.