>>riidom+(OP)
The advice is, in essence, to prioritize your mailing list over audiences on proprietary platforms like Twitter and TikTok. This may work for some, but mailing lists seem like they would be really ineffective for a lot of use cases.
>>rp1+84
Not necessarily "prioritize" so much as "make sure you have good and solid backup." Proprietary platforms are free advertising that can get taken away whenever, so understand the risks of using them. Good mitigation is to maintain strong lines of communication beyond those.