I'd suggest getting them money through patreon, kofi or whatever patrons system they use instead. That's much safer for them than YT ad money and helps them feel less pressure when they get demonetized or whatnot.
Your special kindness is not worth $20/month to even moderately successful creators.
You could possibly pick one channel you like each month and give it a one-time $5 donation, which would be equivalent to years of ad revenue from a single viewer.