I've had all RPi versions except RPi4, running at least 1 of them 24/7 since the first one was released, and by the first year I had a cron that dd'd the card every night, and I found myself dding the backup image at least 2-3 times per year.
RPi3+ has had no problem so far, and I'm not upgrading to RPi4 out of fear of it becoming an unstable mess again.
I did run Boinc on over 20 different SBCs for 2 or 3 years. So they run 24/7 with 100% and I just had 2 broken SD cards from all those SBCs. I guess thats fine.
Schools may have a lab with 30, used 2h per day, makes it more than double my failure rate. Add kids popping the cards in and out all the time and you have a recipe for disaster.
RPi3+ has had no problem so far, and I'm not upgrading to RPi4 out of fear of it becoming an unstable mess again.