Wanted to donate to letsencrypt.org. I use their free service & want it to survive. They only accept min of $10 and they say for bitcoin (only BTC) it must be $1,000. Prolly cuz of fees. Sounds like they don't get it.
Email them, then! i have sent out probably 50 emails to random companies in the past year, and a few of them have actually upgraded to BCH!
