Recurring buys on a single exchange are fine for many. But you give up flexibility.

Multi-exchange routing = split custody + redundancy if one provider has issues.

Some exchange pairs have 0 fee BTC trades; fee drag matters when you DCA for years.

Advanced execution: pause/resume rules, and multiplier DCA for better sizing.

TL;DR: Split your DCA over multiple exchanges: https://dca.bot/en