>>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
The advice is more generalizable than that: move your audience into content in spaces that you own -- not spaces that Zuckbook or Google or TikTok own.