YouTubers pay monthly for screen recording, captions, clipping and scheduling before the channel earns a cent. One-time tools fix the cost of production at the price of a single video's ad revenue.
The tool this job usually means renting is Mailchimp, at $20+/mo (grows with your list) — roughly $240 a year, every year. Postbird does the job for a one-time $149 — running on infrastructure you control.