Here is one I have used to post controversial stuff on Facebook. The advantage is they are right-side-up, but simply use Greek and Cyrillic characters that are easy for humans to read. Search for "text generator" and you can find others. I'll give a sample of this paragraph after the link.

https://fontvilla.com/weird-text/ It has several, but i like this one: hērē คrē ค fēຟ i hคงē นŞē໓ t໐ p໐Şt ¢໐ຖtr໐งērŞiคl Ştนff ໐ຖ fค¢ē๖໐໐k. thē ค໓งคຖtคງē iŞ thēฯ คrē riງht-Şi໓ē-นp, ๖นt Şi๓plฯ นŞē ງrēēk คຖ໓ ¢ฯrilli¢ ¢hคrค¢tērŞ thคt คrē ēคŞฯ f໐r hน๓คຖŞ t໐ rēค໓. i'll ງiงē ค Şค๓plē ໐f thiŞ pคrคງrคph คftēr ēค¢h liຖk.

This works by using foreign language characters that appear to be upside down. So their filters won't be able to read it I'm pretty sure , probably wouldn't work for long because they can fix it so it can filter this too. But its just an idea , check out the site and play around with it and see what you think .

sʞuɐɥʇ ʞO

I have learnt some amazing red pill in youtube comment section where people posted upside down text. They were not refrained by anything, and were able to post the most crazy stuff without any AI catching it. Quite clever if you ask me.

ɐбʍoбʍʍ

Then to read the messages, turn off rotate on Your phone and turn it upside down to read the messages.

Here's a few examples for you all.

Turn you phone upside down to read text below ɯɹoʇs ǝɥʇ WɹO┴S ƎH┴ dɯnɹʇ ԀW∩ɹ┴ uouɐb NON∀Q Q ɐƃɐɯ ∀פ∀W ɐƃʍƖƃʍʍ ∀פMƖפMM