There are no constitutional rights that are unlimited.
Free speech is a right of all of us, but none of us have the right to insight lawless actions, (Brandenburg v Ohio), make false statement of facts ( Gertz v. Robert Welch,Inc.), use speech that breaches the peace (Chaplinsky v. New Hampshire).
It appears to me that Jones regularly used his speech in unprotected ways, and that companies which are now being held accountable for how their platforms are utilized and the impact they are have chose to ban him so they are not held liable for any of the outcomes of his actions.
People do have the right to think and believe what they want. They do not have the right to behave any way they want without restriction.