i have camped in many provincial and national parks and will continue to do so since some places are worth the cost and hassle of booking a site
places like bruce peninsula national park and killarney are too beautiful to not go... why is it a hassle? the site reservation system opens for booking 6 months before the date you want to reserve and you tend to have to make the reservation on that day exactly 6 months ahead or all the spots will be booked
also there is the cost.. while it is not a huge amount .... camping on crown land is free and i do prefer to camp on crown land.
that said i would like to take my nephews on some of the trips i have done... like canoeing a 7 day loop in killarney and also hiking a 7 day loop in killarney (can be done much faster but i prefer to hike in the morning and then explore and enjoy each site for the 2nd half of the day)
there are many places just as scenic and amazing which are crown land and no booking/paying for sites required one example being temagami (7 day canoeing loop for me) but also countless off the beaten path places which you can venture into by referencing the crown land atlas:
https://www.lioapplications.lrc.gov.on.ca/CLUPA/index.html?viewer=CLUPA.CLUPA&locale=en-CA
more on free camping:
https://www.ontario.ca/page/recreational-activities-on-crown-land
you can set up a camp for 21 days at which point (if someone were to have something to say about it) you would have to move youre camp at least 100m and you are good for another 21 days
i like to explore crown land areas for mineral specimens which you are allowed to collect for youre personal collection but not for commercial purposes
you can trade the minerals with other collectors etc but you cannot sell youre finds commercially
the land i bought up north is surrounded by crown land which is nice