Maybe they are using something similar to 'a lie is most convincingly hidden between two truths’. Flood media with unconvincing fake videos, people become complacent in thinking they can recognise them, then slip in a good convincing fake one and people believe it - if that makes sense?

Please can you add ALT text to images you share?

They make posts accessible to people who use screen readers.

You can add a prompt in settings so you never forget #ALT again.