True, however considering RAW you are still limited to the wizard spell list. From the wizard class section (SRD under your spellbook
https://www.dndbeyond.com/classes/wizard)
"Copying a Spell into the Book. When you find a wizard spell of 1st level or higher, you can add it to your spellbook if it is of a spell level you can prepare and if you can spare the time to decipher and copy it.
Copying that spell into your spellbook involves reproducing the basic form of the spell, then deciphering the unique system of notation used by the wizard who wrote it. You must practice the spell until you understand the sounds or gestures required, then transcribe it into your spellbook using your own notation."
Moreover as per RAW you cannot use the scrolls outside of your caster class:
"A spell scroll bears the words of a single spell, written in a mystical cipher. If the spell is on your class’s spell list, you can read the scroll and cast its spell without providing any material components." (DMG page 200, SRD link
https://www.dndbeyond.com/magic-items/spell-scroll).
Personally I do not think that being able to cast any scroll in the game is game breaking (especially considering the revivify scrolls we get), it only sliiightly hurts the Thief subclass of Rogue (at level 13, which probably won't even be in the game), however wizards being able to learn any spell in the game by scribing the scrolls is frankly speaking, a little bit insane.
