Why there are way less free plugins for pocketmine with more options vs the PC version (Spigot)??? I'm curious
I'm not entirely sure what you mean. Do you mean the amount of free plugins there are, or the amount of free plugins vs the amount of paid plugins? Either way, the Minecraft PC (Java) community is larger than Bedrock Edition's or PocketMine's. BE has both a smaller and younger playerbase. I usually just play Java Edition anymore.
Because PHP developers are stupider than Java developers. https://insights.stackoverflow.com/survey/2018#work-_-salary-and-experience-by-language