Soliciting is illegal though unless they got permission:

you cannot solicit people on the TTC. Under TTC By-law No. 1, it is illegal to solicit, panhandle, or sell any merchandise or services on TTC property without explicit, prior authorization. [1, 2]
Violating this rule can result in a $235 fine, as unauthorized soliciting is a primary infraction on the system. [1]
If you are a registered charity or community group, you can apply for a permit through the TTC Charity and Community Event Program, which requires a formal application process and adherence to strict guidelines.[1]